A slum is a heavily populated urban informal settlement characterized by substandard housing and squalor. While slums differ in size and other characteristics, most lack reliable sanitation services, supply of clean water, reliable electricity, law enforcement and other basic services. Slum residences vary from shanty houses to professionally built dwellings that because of poor-quality construction or provision of services have deteriorated into slums.
Slums were common in the 18th to early 20th centuries in the United States and Europe. More recently slums have been predominantly found in urban regions of developing and undeveloped parts of the world, but are also found in developed economies.
According to UN-Habitat, around 33% of the urban population in the developing world in 2012, or about 863 million people, lived in slums. The proportion of urban population living in slums was highest in Sub-Saharan Africa (61.7%), followed by South Asia (35%), Southeast Asia (31%), East Asia (28.2%), West Asia (24.6%), Oceania (24.1%), Latin America and the Caribbean (23.5%), and North Africa (13.3%). Among individual countries, the proportion of urban residents living in slum areas in 2009 was highest in the Central African Republic (95.9%). Between 1990 and 2010 the percentage of people living in slums dropped, even as the total urban population increased. The world's largest slum city is in Mexico City.
Slums form and grow in many different parts of the world for many different reasons. Some causes include rapid rural-to-urban migration, economic stagnation and depression, high unemployment, poverty, informal economy, poor planning, politics, natural disasters and social conflicts. Strategies tried to reduce and transform slums in different countries, with varying degrees of success, include a combination of slum removal, slum relocation, slum upgrading, urban planning with city wide infrastructure development, and public housing projects.
- 1 Etymology and nomenclature
- 2 History
- 3 Causes that create and expand slums
- 4 Characteristics of slums
- 5 Risks
- 6 Countermeasures
- 7 Prevalence
- 8 See also
- 9 References
- 10 Further reading
Etymology and nomenclature
Numerous other non English terms are often used interchangeably with slum: shanty town, favela, rookery, gecekondu, skid row, barrio, ghetto, bidonville, taudis, bandas de miseria, barrio marginal, morro, loteamento, barraca, musseque, tugurio, solares, mudun safi, karyan, medina achouaia, brarek, ishash, galoos, tanake, baladi, hrushebi, chalis, katras, zopadpattis, bustee, estero, looban, dagatan, umjondolo, watta, udukku, and chereka bete.
Slums were common in the United States and Europe before the early 20th century. London's East End is generally considered the locale where the term originated in the 19th century, where massive and rapid urbanisation of the dockside and industrial areas of led to intensive overcrowding in a warren of post-medieval streetscape. The suffering of the poor was described in popular fiction by moralist authors such as Charles Dickens- most famously Oliver Twist (1837-9) and echoed the 'Christian Socialist' values of the time, which soon found legal expression in the Public Health Act of 1848. As the slum clearance movement gathered pace, deprived areas such as Old Nichol were fictionalised to raise awareness in the middle classes in the form of moralist novels such as A Child of the Jago (1896) resulting in slum clearance and reconstruction programmes such as the exemplary Boundary Estate (1893-1900) and the creation of charitable trusts such as the Peabody Trust founded in 1862 and Joseph Rowntree Foundation(1904) which still operate to provide decent housing today.
Slums are now often associated with Victorian Britain, particularly in industrial English towns, lowland Scottish towns and Dublin City in Ireland. Engels described these British neighborhoods as "cattle-sheds for human beings". These were generally still inhabited until the 1940s, when the government started slum clearance and built new council houses. There are still many examples left of former slum housing in the UK, but many have been removed by government initiative, redesigned and replaced with better public housing. In Europe, slums were common. By the 1920s it had become a common slang expression in England, meaning either various taverns and eating houses, "loose talk" or gypsy language, or a room with "low going-ons". In Life in London Pierce Egan used the word in the context of the "back slums" of Holy Lane or St Giles. A footnote defined slum to mean "low, unfrequent parts of the town". Charles Dickens used the word slum in a similar way in 1840, writing "I mean to take a great, London, back-slum kind walk tonight". Slum began to be used to describe bad housing soon after and was used as alternative expression for rookeries. In 1850 the Catholic Cardinal Wiseman described the area known as Devil's Acre in Westminster, London as follows:
"Close under the Abbey of Westminster there lie concealed labyrinths of lanes and potty and alleys and slums, nests of ignorance, vice, depravity, and crime, as well as of squalor, wretchedness, and disease; whose atmosphere is typhus, whose ventilation is cholera; in which swarms of huge and almost countless population, nominally at least, Catholic; haunts of filth, which no sewage committee can reach – dark corners, which no lighting board can brighten."
In France as in most industrialised European capitals, slums were widespread in Paris and other urban areas in the 19th century, many of which continued through first half of the 20th century. The first cholera epidemic of 1832 triggered a political debate, and Louis René Villermé study of various arrondissements of Paris demonstrated the differences and connection between slums, poverty and poor health. Melun Law first passed in 1849 and revised in 1851, followed by establishment of Paris Commission on Unhealthful Dwellings in 1852 began the social process of identifying the worst housing inside slums, but did not remove or replace slums. After World War II, French people started mass migration from rural to urban areas of France. This demographic and economic trend rapidly raised rents of existing housing as well as expanded slums. French government passed laws to block increase in the rent of housing, which inadvertently made many housing projects unprofitable and increased slums. In 1950, France launched its Habitation à Loyer Modéré initiative to finance and build public housing and remove slums, managed by techniciens – urban technocrats., and financed by Livret A – a tax free savings account for French public.
Five Points slum used to be a lake named Collect. By the late 1700s, the lake was surrounded by slaughterhouses and tanneries, which emptied their waste directly into this lake. Trash piled, modern waste collection and sanitation system, electricity and other technologies had yet to be invented and adopted. The lake was a reeking cesspool. By the early 1800s Lake Collect of New York City was filled up and dry, and on it was Five Points – United States’ first slum. Five Points was occupied by successive waves of freed slaves, Irish, then Italian, then Chinese, immigrants. It housed the poor, rural people leaving farms for opportunity, and the persecuted people from Europe pouring into New York City. Bars, bordellos, squalid and lightless tenements lined its streets. Violence and crime were commonplace. Politicians and social elite discussed it with derision. Slums like Five Points triggered discussions of affordable housing and slum removal. Today, Five Points slum has transformed into the Little Italy and Chinatown neighborhood of New York City.
Five Points was not the only slum in America. Jacob Riis, Walker Evans, Lewis Hine and others photographed many before World War II. Slums were found in every major urban region of the United States in the early 20th century, before and through the Great Depression. Slums, sometimes called poorhouses, crowded the Boston Commons, later at the fringes of the city.
Rio de Janeiro documented its first slum in 1920 census. By the 1960s, over 33% of population of Rio lived in slums, 45% of Mexico City and Ankara, 65% of Algiers, 35% of Caracas, 25% of Lima and Santiago, 15% of Singapore. By 1980, in various cities and towns of Latin America alone, there were about 25,000 slums.
Causes that create and expand slums
Slums sprout and continue for a combination of demographic, social, economic, and political reasons. Common causes include rapid rural-to-urban migration, poor planning, economic stagnation and depression, poverty, high unemployment, informal economy, colonialism and segregation, politics, natural disasters and social conflicts.
Rural-urban migration is one of the causes attributed to the formation and expansion of slums. Since 1950, world population has increased at a far greater rate than the total amount of arable land, even as agriculture contributes a much smaller percentage of the total economy. For example, in India, agriculture accounted for 52% of its GDP in 1954 and only 19% in 2004; in Brazil, the 2005 GDP contribution of agriculture is one-fifth of its contribution in 1951. Agriculture, meanwhile, has also become higher yielding, less disease prone, less physically harsh and more efficient with tractors and other equipment. The proportion of people working in agriculture has declined by 30% over the last 50 years, while global population has increased by 250%.
Many people move to urban areas primarily because cities promise more jobs, better schools for poor's children, and diverse income opportunities than subsistence farming in rural areas. For example, in 1995, 95.8% of migrants to Surabaya, Indonesia reported that jobs were their primary motivation for moving to the city. However, some rural migrants may not find jobs immediately because of their lack of skills and the increasingly competitive job markets, which leads to their financial shortage. Many cities, on the other hand, do not provide enough low-cost housing for a large number of rural-urban migrant workers. Some rural-urban migrant workers cannot afford housing in cities and eventually settle down in only affordable slums. Further, rural migrants, mainly lured by higher incomes, continue to flood into cities. They thus expand the existing urban slums.
According to Ali and Toran, social networks might also explain rural-urban migration and people's ultimate settlement in slums. In addition to migration for jobs, a portion of people migrate to cities because of their connection with relatives or families. Once their family support in urban areas is in slums, those rural migrants intend to live with them in slums 
The formation of slums is closely linked to urbanization. In 2008, more than 50% of the world’s population lived in urban areas. In China, for example, it is estimated that the population living in urban areas will increase by 10% within a decade according to its current rates of urbanization. The UN-Habitat reports that 43% of urban population in developing countries and 78% of those in the least developed countries are slum dwellers.
Some scholars suggest that urbanization creates slums because local governments are unable to manage urbanization, and migrant workers without an affordable place to live in, dwell in slums. Rapid urbanization drives economic growth and causes people to seek working and investment opportunities in urban areas. However, as evidenced by poor urban infrastructure and insufficient housing, the local governments sometimes are unable to manage this transition. This incapacity can be attributed to insufficient funds and inexperience to handle and organize problems brought by migration and urbanization. In some cases, local governments ignore the flux of immigrants during the process of urbanization. Such examples can be found in many African countries. In the early 1950s, many African governments believed that slums would finally disappear with economic growth in urban areas. They neglected rapidly spreading slums due to increased rural-urban migration caused by urbanization. Some governments, moreover, mapped the land where slums occupied as undeveloped land.
Another type of urbanization does not involve economic growth but economic stagnation or low growth, mainly contributing to slum growth in Sub-Saharan Africa and parts of Asia. This type of urbanization involves a high rate of unemployment, insufficient financial resources and inconsistent urban planning policy. In these areas, an increase of 1% in urban population will result in an increase of 1.84% in slum prevalence.
Urbanization might also force some people to live in slums when it influences land use by transforming agricultural land into urban areas and increases land value. During the process of urbanization, some agricultural land is used for additional urban activities. More investment will come into these areas, which increases the land value. Before some land is completely urbanized, there is a period when the land can be used for neither urban activities nor agriculture. The income from the land will decline, which decreases the people’s incomes in that area. The gap between people’s low income and the high land price forces some people to look for and construct cheap informal settlements, which are known as slums in urban areas. The transformation of agricultural land also provides surplus labor, as peasants have to seek jobs in urban areas as rural-urban migrant workers.
Many slums are part of economies of agglomeration in which there is an emergence of economies of scale at the firm level, transport costs and the mobility of the industrial labour force. The increase in returns of scale will mean that the production of each good will take place in a single location. And even though an agglomerated economy benefits these cities by bringing in specialization and multiple competing suppliers, the conditions of slums continue to lag behind in terms of quality and adequate housing. Alonso-Villar argues that the existence of transport costs implies that the best locations for a firm will be those with easy access to markets, and the best locations for workers, those with easy access to goods. The concentration is the result of a self-reinforcing process of agglomeration. Concentration is a common trend of the distribution of population. Urban growth is dramatically intense in the less developed countries, where a large number of huge cities have started to appear; which means high poverty rates, crime, pollution and congestion.
Poor housing planning
Lack of affordable low cost housing and poor planning encourages the supply side of slums. The Millennium Development Goals proposes that member nations should make a “significant improvement in the lives of at least 100 million slum dwellers” by 2020. If member nations succeed in achieving this goal, 90% of the world total slum dwellers may remain in the poorly housed settlements by 2020. Choguill claims that the large number of slum dwellers indicates a deficiency of practical housing policy. Whenever there is a significant gap in growing demand for housing and insufficient supply of affordable housing, this gap is typically met in part by slums. The Economist summarizes this as, "good housing is obviously better than a slum, but a slum is better than none".
Insufficient financial resources  and lack of coordination in government bureaucracy  are two main causes of poor housing planning. Financial deficiency in some governments may explain the lack of affordable public housing for the poor since any improvement of the tenant in slums and expansion of public housing programs involve a great increase in the government expenditure. The problem can also lie on the failure in coordination among different departments in charge of economic development, urban planning, and land allocation. In some cities, governments assume that the housing market will adjust the supply of housing with a change in demand. However, with little economic incentive, the housing market is more likely to develop middle-income housing rather than low-cost housing. The urban poor gradually become marginalized in the housing market where few houses are built to sell to them.
Colonialism and segregation
Some of the slums in today’s world are a product of urbanization brought by colonialism. For instance, the Europeans arrived in Kenya in the nineteenth century and created urban centers such as Nairobi mainly to serve their financial interests. They regarded the Africans as temporary migrants and needed them only for supply of labor. The housing policy aiming to accommodate these workers was not well enforced and the government built settlements in the form of single-occupancy bedspaces. Due to the cost of time and money in their movement back and forth between rural and urban areas, their families gradually migrated to the urban centre. As they could not afford to buy houses, slums were thus formed.
Others were created because of segregation imposed by the colonialists. For example, Dharavi slum of Mumbai – now one of the largest slums in India, used to be a village referred to as Koliwadas, and Mumbai used to be referred as Bombay. In 1887, the British colonial government expelled all tanneries, other noxious industry and poor natives who worked in the peninsular part of the city and colonial housing area, to what was back then the northern fringe of the city – a settlement now called Dharavi. This settlement attracted no colonial supervision or investment in terms of road infrastructure, sanitation, public services or housing. The poor moved into Dharavi, found work as servants in colonial offices and homes and in the foreign owned tanneries and other polluting industries near Dharavi. To live, the poor built shanty towns within easy commute to work. By 1947, the year India became an independent nation of the commonwealth, Dharavi had blossomed into Bombay’s largest slum. 
Similarly, some of the slums of Lagos, Nigeria sprouted because of neglect and policies of the colonial era. During apartheid era of South Africa, under the pretext of sanitation and plague epidemic prevention, racial and ethnic group segregation was pursued, people of color were moved to the fringes of the city, policies that created Soweto and other slums – officially called townships. Large slums started at the fringes of segregation-conscious colonial city centers of Latin America. Marcuse suggests ghettoes in the United States, and elsewhere, have been created and maintained by the segregationist policies of the state and regionally dominant group.
Social exclusion and poor infrastructure forces the poor to adapt to conditions beyond his or her control. Poor families that cannot afford transportation, or those who simply lack any form of affordable public transportation, generally end up in squat settlements within walking distance or close enough to the place of their formal or informal employment. Ben Arimah cites this social exclusion and poor infrastructure as a cause for numerous slums in African cities. Poor quality, unpaved streets encourage slums; a 1% increase in paved all-season roads, claims Arimah, reduces slum incidence rate by about 0.35%. Affordable public transport and economic infrastructure empowers poor people to move and consider housing options other than their current slums.
A growing economy that creates jobs at rate faster than population growth, offers people opportunities and incentive to relocate from poor slum to more developed neighborhoods. Economic stagnation, in contrast, creates uncertainties and risks for the poor, encouraging people to stay in the slums. Economic stagnation in a nation with a growing population reduces per capita disposal income in urban and rural areas, increasing urban and rural poverty. Rising rural poverty also encourages migration to urban areas. A poorly performing economy, in other words, increases poverty and rural-to-urban migration, thereby increasing slums.
Many slums grow because of growing informal economy which creates demand for workers. Informal economy is that part of an economy that is neither registered as a business nor licensed, one that does not pay taxes and is not monitored by local or state or federal government. Informal economy grows faster than formal economy when government laws and regulations are opaque and excessive, government bureaucracy is corrupt and abusive of entrepreneurs, labor laws are inflexible, or when law enforcement is poor. Urban informal sector is between 20 and 60% of most developing economies’ GDP; in Kenya, 78 per cent of non-agricultural employment is in the informal sector making up 42 per cent of GDP. In many cities the informal sector accounts for as much as 60 per cent of employment of the urban population. For example, in Benin, slum dwellers comprise 75 per cent of informal sector workers, while in Burkina Faso, the Central African Republic, Chad and Ethiopia, they make up 90 per cent of the informal labour force. Slums thus create an informal alternate economic ecosystem, that demands low paid flexible workers, something impoverished residents of slums deliver. In other words, countries where starting, registering and running a formal business is difficult, tend to encourage informal businesses and slums. Without a sustainable formal economy that raise incomes and create opportunities, squalid slums are likely to continue.
The World Bank and UN Habitat estimate, assuming no major economic reforms are undertaken, more than 80% of additional jobs in urban areas of developing world may be low-paying jobs in the informal sector. Everything else remaining same, this explosive growth in the informal sector is likely to be accompanied by a rapid growth of slums.
Urban poverty encourages the formation and demand for slums. With rapid shift from rural to urban life, poverty migrates to urban areas. The urban poor arrives with hope, and very little of anything else. He or she typically has no access to shelter, basic urban services and social amenities. Slums are often the only option for the urban poor.
Many local and national governments have, for political interests, subverted efforts to remove, reduce or upgrade slums into better housing options for the poor. Throughout the second half of the 19th century, for example, French political parties relied on votes from slum population and had vested interests in maintaining that voting block. Removal and replacement of slum created a conflict of interest, and politics prevented efforts to remove, relocate or upgrade the slums into housing projects that are better than the slums. Similar dynamics are cited in favelas of Brazil, slums of India, and shanty towns of Kenya.
Scholars claim politics also drives rural-urban migration and subsequent settlement patterns. Pre-existing patronage networks, sometimes in the form of gangs and other times in the form of political parties or social activists, inside slums seek to maintain their economic, social and political power. These social and political groups have vested interests to encourage migration by ethnic groups that will help maintain the slums, and reject alternate housing options even if the alternate options are better in every aspect than the slums they seek to replace.
Millions of Lebanese people formed slums during the civil war from 1975 to 1990. Similarly, in recent years, numerous slums have sprung around Kabul to accommodate rural Afghans escaping Taliban violence.
Major natural disasters in poor nations often lead to migration of disaster-affected families from areas crippled by the disaster to unaffected areas, the creation of temporary tent city and slums, or expansion of existing slums. These slums tend to become permanent because the residents do not want to leave, as in the case of slums near Port-au-Prince after the 2010 Haiti earthquake, and slums near Dhaka after 2007 Bangladesh Cyclone Sidr.
Characteristics of slums
Location and growth
Slums typically begin at the outskirts of a city. Over time, the city may expand past the original slums, enclosing the slums inside the urban perimeter. New slums sprout at the new boundaries of the expanding city, usually on publicly owned lands, thereby creating an urban sprawl mix of formal settlements, industry, retail zones and slums. This makes the original slums valuable property, densely populated with many conveniences attractive to the poor.
At their start, slums are typically located in least desirable lands near the town or city, that are state owned or philanthropic trust owned or religious entity owned or have no clear land title. In cities located over a mountainous terrain, slums begin on difficult to reach slopes or start at the bottom of flood prone valleys, often hidden from plain view of city center but close to some natural water source. In cities located near lagoons, marshlands and rivers, they start at banks or on stilts above water or the dry river bed; in flat terrain, slums begin on lands unsuitable for agriculture, near city trash dumps, next to railway tracks, and other shunned undesirable locations.
These strategies shield slums from the risk of being noticed and removed when they are small and most vulnerable to local government officials. Initial homes tend to be tents and shacks that are quick to install, but as slum grows, becomes established and newcomers pay the informal association or gang for the right to live in the slum, the construction materials for the slums switches to more lasting materials such as bricks and concrete, suitable for slum’s topography.
The original slums, over time, get established next to centers of economic activity, schools, hospitals, sources of employment, which the poor rely on. Established old slums, surrounded by the formal city infrastructure, cannot expand horizontally; therefore, they grow vertically by stacking additional rooms, sometimes for a growing family and sometimes as a source of rent from new arrivals in slums. Some slums name themselves after founders of political parties, locally respected historical figures, current politicians or politician’s spouse to garner political backing against eviction.
Informality of land tenure is a key characteristic of urban slums. At their start, slums are typically located in least desirable lands near the town or city, that are state owned or philanthropic trust owned or religious entity owned or have no clear land title. Some immigrants regard unoccupied land as land without owners and therefore occupy it. In some cases the local community or the government allots lands to people, which will later develop into slums and over which the dwellers don’t have property rights. Informal land tenure also includes occupation of land belonging to someone else. According to Flood, 51 percent of slums are based on invasion to private land in sub-Saharan Africa, 39 percent in North Africa and West Asia, 10 percent in South Asia, 40 percent in East Asia, and 40 percent in Latin America and the Caribbean. In some cases, once the slum has many residents, the early residents form a social group, an informal association or a gang that controls newcomers, charges a fee for the right to live in the slums, and dictates where and how new homes get built within the slum. The newcomers, having paid for the right, feel they have commercial right to the home in that slum. The slum dwellings, built earlier or in later period as the slum grows, are constructed without checking land ownership rights or building codes, are not registered with the city, and often not recognized by the city or state governments.
Secure land tenure is important for slum dwellers as an authentic recognition of their residential status in urban areas. It also encourages them to upgrade their housing facilities, which will give them protection against natural and unnatural hazards. Undocumented ownership with no legal title to the land also prevents slum settlers from applying for mortgage, which might worsen their financial situations. In addition, without registration of the land ownership, the government has difficulty in upgrading basic facilities and improving the living environment. Insecure tenure of the slum, as well as lack of socially and politically acceptable alternatives to slums, also creates difficulty in city-wide infrastructure development such as rapid mass transit, electrical line and sewer pipe layout, highways and roads.
Substandard housing and overcrowding
Slum areas are characterized by substandard housing structures. Shanty homes are often built hurriedly, on ad hoc basis, with materials unsuitable for housing. Often the construction quality is inadequate to withstand heavy rains, high winds, or other local climate and location. Paper, plastic, earthen floors, mud-and-wattle walls, wood held together by ropes, straw or torn metal pieces as roofs are some of the materials of construction. In some cases, brick and cement is used, but without attention to proper design and structural engineering requirements. Various space, dwelling placement bylaws and local building codes may also be extensively violated.
Overcrowding is another characteristic of slums. Many dwellings are single room units, with high occupancy rates. Each dwelling may be cohabited by multiple families. Five and more persons may share a one-room unit; the room is used for cooking, sleeping and living. Overcrowding is also seen near sources of drinking water, cleaning, and sanitation where one toilet may serve dozens of families. In a slum of Kolkata, India, over 10 people sometimes share a 45 m2 room. In Kibera slum of Nairobi, Kenya, population density is estimated at 2,000 people per hectare — or about 500,000 people in one square mile.
Inadequate or no infrastructure
One of the identifying characteristics of slums is the lack of or inadequate public infrastructure. From safe drinking water to electricity, from basic health care to police services, from affordable public transport to fire/ambulance services, from sanitation sewer to paved roads, new slums usually lack all of these. Established, old slums sometimes garner official support and get some of these infrastructure such as paved roads and unreliable electricity or water supply.
Slums often have very narrow alleys that do not allow vehicles (including emergency vehicles) to pass. The lack of services such as routine garbage collection allows rubbish to accumulate in huge quantities. The lack of infrastructure is caused by the informal nature of settlement and no planning for the poor by government officials. Fires are often a serious problem.
In many countries, local and national government often refuse to recognize slums, because the slum are on disputed land, or because of the fear that quick official recognition will encourage more slum formation and seizure of land illegally. Recognizing and notifying slums often triggers a creation of property rights, and requires that the government provide public services and infrastructure to the slum residents. With poverty and informal economy, slums do not generate tax revenues for the government and therefore tend to get minimal or slow attention. In other cases, the narrow and haphazard layout of slum streets, houses and substandard shacks, along with persistent threat of crime and violence against infrastructure workers, makes it difficult to layout reliable, safe, cost effective and efficient infrastructure. In yet others, the demand far exceeds the government bureaucracy’s ability to deliver.
Vulnerability to natural and unnatural hazards
Slums are often placed amongs the places vulnerable to natural disasters such as landslides and floods. In cities located over a mountainous terrain, slums begin on slopes difficult to reach or start at the bottom of flood prone valleys, often hidden from plain view of city center but close to some natural water source. In cities located near lagoons, marshlands and rivers, they start at banks or on stilts above water or the dry river bed; in flat terrain, slums begin on lands unsuitable for agriculture, near city trash dumps, next to railway tracks, and other shunned, undesirable locations. These strategies shield slums from the risk of being noticed and removed when they are small and most vulnerable to local government officials. However, the ad hoc construction, lack of quality control on building materials used, poor maintenance, and uncoordinated spatial design make them prone to extensive damage during earthquakes as well from decay.
Some slums risk man-made hazards such as toxic industries, traffic congestion and collapsing infrastructure. Fires are another major risk to slums and its inhabitants, with streets too narrow to allow proper and quick access to fire control trucks.
Unemployment and informal economy
Due to lack of skills and education as well as competitive job markets, many slum dwellers face high rates of unemployment. The limit of job opportunities causes many of them to employ themselves in the informal economy, inside the slum or in developed urban areas near the slum. This can sometimes be licit informal economy or illicit informal economy without working contract or any social security. Some of them are seeking jobs at the same time and some of those will eventually find jobs in formal economies after gaining some professional skills in informal sectors.
Examples of licit informal economy include street vending, household enterprises, product assembly and packaging, making garlands and embroideries, domestic work, shoe polishing or repair, driving tuk-tuk or manual rickshaws, construction workers or manually driven logistics, and handicrafts production. In some slums, people sort and recycle trash of different kinds (from household garbage to electronics) for a living – selling either the odd usable goods or stripping broken goods for parts or raw materials. Typically these licit informal economies require the poor to regularly pay a bribe to local police and government officials.
Examples of illicit informal economy include illegal substance and weapons trafficking, drug or moonshine/changaa production, prostitution and gambling – all sources of risks to the individual, families and society. Recent reports reflecting illicit informal economies include drug trade and distribution in Brazil’s favelas, production of fake goods in the colonías of Tijuana, smuggling in katchi abadis and slums of Karachi, or production of synthetic drugs in the townships of Johannesburg.
The slum-dwellers in informal economies run many risks. The informal sector, by its very nature, means income insecurity and lack of social mobility. There is also absence of legal contracts, protection of labor rights, regulations and bargaining power in informal employments.
Some scholars suggest that crime is one of the main concerns in slums. Empirical data suggest crime rates are higher in some slums than in non-slums, with slum homicides alone reducing life expectancy of a resident in a Brazil slum by 7 years than for a resident in nearby non-slum. In some countries like Venezuela, officials have sent in the military to control slum criminal violence involved with drugs and weapons. Rape is another serious issue related to crime in slums. In Nairobi slums, for example, one fourth of all teenage girls are raped each year.
On the other hand, while UN-Habitat reports some slums are more exposed to crimes with higher crime rates (for instance, the traditional inner-city slums), crime is not the direct resultant of block layout in many slums. Rather crime is one of the symptoms of slum dwelling; thus slums consist of more victims than criminals. Consequently, slums in all do not have consistently high crime rates; slums have the worst crime rates in sectors maintaining influence of illicit economy – such as drug trafficking, brewing, prostitution and gambling –. Often in such circumstance, multiple gangs fight for control over revenue.
Slum crime rate correlates with insufficient law enforcement and inadequate public policing. In main cities of developing countries, law enforcement lags behind urban growth and slum expansion. Often police can not reduce crime because, due to ineffective city planning and governance, slums set inefficient crime prevention system. Such problems is not primarily due to community indifference. Leads and information intelligence from slums are rare, streets are narrow and a potential death traps to patrol, and many in the slum community have an inherent distrust of authorities from fear ranging from eviction to collection on unpaid utility bills to general law and order. Lack of formal recognition by the governments also leads to few formal policing and public justice institutions in slums.
Women in slums are at greater risk of physical and sexual violence. Factors such as unemployment that lead to insufficient resources in the household can increase marital stress and therefore exacerbate domestic violence.
Slums are often non-secured areas and women often risk sexual violence when they walk alone in slums late at night. Violence against women and women’s security in slums emerge as recurrent issues.
Another prevalent form of violence in slums is armed violence (gun violence), mostly existing in African and Latin American slums. It leads to homicide and the emergence of criminal gangs. Typical victims are male slum residents. Violence often leads to retaliatory and vigilante violence within the slum. Gang and drug wars are endemic in some slums, predominantly between male residents of slums. The police sometimes participate in gender-based violence against men as well by picking up some men, beating them and putting them in jail. Domestic violence against men also exists in slums, including verbal abuses and even physical violence from households.
Cohen as well as Merton theorized that the cycle of slum violence does not mean slums are inevitably criminogenic, rather in some cases it is frustration against life in slum, and a consequence of denial of opportunity to slum residents to leave the slum. Further, crime rates are not uniformly high in world’s slums; the highest crime rates in slums are seen where illicit economy - such as drug trafficking, brewing, prostitution and gambling - is strong and multiple gangs are fighting for control.
Slum dwellers usually experience a high rate of disease. Diseases that have been reported in slums include cholera, HIV/AIDS, measles, malaria, dengue, typhoid, drug resistant tuberculosis, and other epidemics. Studies focus on children’s health in slums address that cholera and diarrhea are especially common among young children. In Haiti (where a majority of the population live in poverty), after the 2010 Earthquake, an outbreak of Cholera spread throughout the country, killing 8321 people. Besides children’s vulnerability to diseases, many scholars also focus on high HIV/AID prevalence in slums among women. In some slums, gender inequality increases women’s risk of HIV/AIDS. Mutual monogamy or using condoms are two main ways to prevent HIV/AIDS, but some women might not be able to modify their behaviors due to masculine authority or violence. Furthermore, diseases can sometimes lead to high mortality in slums. According to a study in Nairobi’s slums, HIV/AIDS and tuberculosis attributed to about 50% of the mortality burden.
High population densities, poor living conditions, low vaccination rates, insufficient health-related data and inadequate health service engender a higher rate of disease transmission in slums than that in non-slum areas. Overcrowding leads to faster and wider spread of diseases due to the limited space in slum housing. Poor living conditions also make slum dwellers more vulnerable to certain diseases. Poor water quality, a manifest example, is a cause of many major illnesses including malaria, diarrhea and trachoma. As Sur et al. suggest, improving living conditions such as introduction of better sanitation and access to basic facilities can ameliorate the effects of diseases.
In addition to poor living conditions, low vaccination rates cause excess cases of disease in slums as well. Slum children are less likely to be vaccinated mainly because some slum dwellers refuse vaccinations without understanding its importance or no one at home is able to take the child to health sectors for vaccinations. Lack of reliable data also has a negative impact on slum dwellers’ health. A number of slum families do not report cases or seek professional medical care, which results in insufficient data. This might prevent appropriate allocation of health care resources in slum areas since many countries base their health care plans on data from clinic, hospital, or national mortality registry. Moreover, health service does not exist in most of the world’s slums. Emergency ambulance service and urgent care is typically unavailable in slums. Health service providers avoid servicing slums. A study shows that more than half of slum dwellers are prone to visit private practitioners or seek self-medication with medicines available in the home. Private practitioners in slums are usually those who are unlicensed or poorly trained and they run clinics and pharmacies mainly for the sake of money. Recent study has shown that there has been substantial improvement in the health awareness of the slum dwellers of Mumbai with regards to HIV/AIDS and Diabetes 
Child malnutrition is more common in slums than in non-slum areas. In Mumbai and New Delhi, 47% and 51% of slum children under the age of five are stunted and 35% and 36% of them are underweighted. These children all suffer from third-degree malnutrition, the most severe level, according to WHO standards. A study conducted by Tada et al. in Bangkok slums illustrates that in terms of weight-forage, 25.4% of the children who participated in the survey suffered from malnutrition, compared to around 8% national malnutrition prevalence in Thailand. In Ethiopia and the Niger, rates of child malnutrition in urban slums are around 40%.
The major nutritional problems in slums are protein-energy malnutrition (PEM), vitamin A deficiency (VAD), iron deficiency anemia (IDA) and iodine deficiency disorders (IDD). Malnutrition can sometimes lead to death among children. Dr. Abhay Bang's report shows that malnutrition kills 56,000 children annually in urban slums in India.
Widespread child malnutrition in slums is closely related to family income, mothers’ food practice, mothers’ educational level, and maternal employment or housewifery. Poverty may result in inadequate food intake when people cannot afford to buy and store enough food, which leads to malnutrition. Another common cause is mothers’ faulty feeding practices, including inadequate breastfeeding and wrongly preparation of food for children. Tada et al.'s study in Bangkok slums shows that around 64% of the mothers sometimes fed their children instant food instead of a normal meal. And about 70% of the mothers did not provide their children three meals everyday. Mothers’ lack of education leads to their faulty feeding practices. Many mothers in slums don’t have knowledge on food nutrition for children. Maternal employment also influences children's nutritional status. For the mothers who work outside, their children are prone to be malnourished. These children are likely to be neglected by their mothers or sometimes not carefully looked after by their female relatives. Recent study has shown improvements in health awareness in adolescent age group of a rural slum area.
Slums have been historically linked to epidemics. This trend has continued in modern times. For example, the slums of West African nations such as Liberia were crippled by as well as contributed to the outbreak and spread of Ebola in 2014. Slums are considered a major public health concern and potential breeding grounds of drug resistant diseases for the entire city, the nation, as well as the global community.
Recent years have seen a dramatic growth in the number of slums as urban populations have increased in developing countries. Nearly a billion people worldwide live in slums, and some project the figure may grow to 2 billion by 2030, if governments and global community ignore slums and continue current urban policies. United Nations Habitat group believes change is possible. To achieve the goal of “cities without slums”, the UN claims that governments must undertake vigorous urban planning, city management, infrastructure development, slum upgrading and poverty reduction.
Some city governments and state officials have simply sought to remove slums. This strategy for dealing with slums is rooted in the fact that slums typically start illegally on someone else’s land property, and they are not recognized by the state. As the slum started by violating another's property rights, the residents have no legal claim to the land.
Critics argue that slum removal by force tend to ignore the social problems that cause slums. The poor children as well as working adults of a city’s informal economy need a place to live. Slum clearance removes the slum, but it does not remove the causes that create and maintain the slum.
Slum relocation strategies rely on removing the slums and relocating the slum poor to free semi-rural peripheries of cities, sometimes in free housing. This strategy ignores several dimensions of a slum life. The strategy sees slum as merely a place where the poor lives. In reality, slums are often integrated with every aspect of a slum resident’s life, including sources of employment, distance from work and social life. Slum relocation that displaces the poor from opportunities to earn a livelihood, generates economic insecurity in the poor. In some cases, the slum residents oppose relocation even if the replacement land and housing to the outskirts of cities is free and of better quality than their current house. Examples include Zone One Tondo Organization of Manila, Philippines and Abahlali baseMjondolo of Durban, South Africa. In other cases, such as Ennakhil slum relocation project in Morocco, systematic social mediation has worked. The slum residents have been convinced that their current location is a health hazard, prone to natural disaster, or that the alternative location is well connected to employment opportunities.
Some governments have begun to approach slums as a possible opportunity to urban development by slum upgrading. This approach was inspired in part by the theoretical writings of John Turner in 1972. The approach seeks to upgrade the slum with basic infrastructure such as sanitation, safe drinking water, safe electricity distribution, paved roads, rain water drainage system, and bus/metro stops. The assumption behind this approach is that if slums are given basic services and tenure security – that is, the slum will not be destroyed and slum residents will not be evicted, then the residents will rebuild their own housing, engage their slum community to live better, and over time attract investment from government organizations and businesses. Turner argued to demolish the housing, but to improve the environment: if governments can clear existing slums of unsanitary human waste, polluted water and litter, and from muddy unlit lanes, they do not have to worry about the shanty housing. Squatters have shown great organizational skills in terms of land management and will maintain the infrastructure that is provided.
In Mexico City for example, the government attempted to upgrade and urbanize settled slums in the periphery during the 1970s and 1980s by including basic amenities such as concrete roads, parks, illumination and sewage. Currently, most slums in Mexico City face basic characteristics of traditional slums, characterized to some extent in housing, population density, crime and poverty, however, the vast majority of its inhabitants have access to basic amenities and most areas are connected to major roads and completely urbanized. Nevertheless, smaller settlements lacking these can still be found in the periphery of the city and its inhabitants are known as "paracaidistas". Another example of this approach is the slum upgrade in Tondo slum near Manila, Philippines. The project was anticipated to be complete in four years, but it took nine. There was a large increase in cost, numerous delays, re-engineering of details to address political disputes, and other complications after the project. Despite these failures, the project reaffirmed the core assumption and Tondo families did build their own houses of far better quality than originally assumed. Tondo residents became property owners with a stake in their neighborhood. A more recent example of slum-upgrading approach is PRIMED initiative in Medellin, Colombia, where streets, Metrocable transportation and other public infrastructure has been added. These slum infrastructure upgrades were combined with city infrastructure upgrade such as addition of metro, paved roads and highways to empower all city residents including the poor with reliable access throughout city.
Most slum upgrading projects, however, have produced mixed results. While initial evaluations were promising and success stories widely reported by media, evaluations done 5 to 10 years after a project completion have been disappointing. Herbert Werlin notes that the initial benefits of slum upgrading efforts have been ephemeral. The slum upgrading projects in kampungs of Jakarta Indonesia, for example, looked promising in first few years after upgrade, but thereafter returned to a condition worse than before, particularly in terms of sanitation, environmental problems and safety of drinking water. Communal toilets provided under slum upgrading effort were poorly maintained, and abandoned by slum residents of Jakarta. Similarly slum upgrading efforts in Philippines, India and Brazil have proven to be excessively expensive than initially estimated, and the condition of the slums 10 years after completion of slum upgrading has been slum like. The anticipated benefits of slum upgrading, claims Werlin, have proven to be a myth.
Slum upgrading is largely a government controlled, funded and run process, rather than a competitive market driven process. Krueckeberg and Paulsen note conflicting politics, government corruption and street violence in slum regularization process is part of the reality. Slum upgrading and tenure regularization also upgrade and regularize the slum bosses and political agendas, while threatening the influence and power of municipal officials and ministries. Slum upgrading does not address poverty, low paying jobs from informal economy, and other characteristics of slums. It is unclear whether slum upgrading can lead to long term sustainable improvement to slums.
Urban infrastructure development and public housing
Urban infrastructure such as reliable high speed mass transit system, motorways/interstates, and public housing projects have been cited as responsible for the disappearance of major slums in the United States and Europe from the 1960s through 1970s. Charles Pearson argued in UK Parliament that mass transit would enable London to reduce slums and relocate slum dwellers. His proposal was initially rejected for lack of land and other reasons; but Pearson and others persisted with creative proposals such as building the mass transit under the major roads already in use and owned by the city. London Underground was born, and its expansion has been credited to reducing slums in respective cities (and to an extent, the New York City Subway's smaller expansion).
As cities expanded and business parks scattered due to cost ineffectiveness, people moved to live in the suburbs; thus retail, logistics, house maintenance and other businesses followed demand patterns. City governments used infrastructure investments and urban planning to distribute work, housing, green areas, retail, schools and population densities. Affordable public mass transit in cities such as New York City, London and Paris allowed the poor to reach areas where they could earn a livelihood. Public and council housing projects cleared slums and provided more sanitary housing options than what existed before the 1950s.
Slum clearance became a priority policy in Europe between 1950–1970s, and one of the biggest state-led programs. In the UK, the slum clearance effort was bigger in scale than the formation of British Railways, the National Health Service and other state programs. UK Government data suggests the clearances that took place after 1955 demolished about 1.5 million slum properties, resettling about 15% of UK's population out of these properties. Similarly, after 1950, Denmark and others pursued parallel initiatives to clear slums and resettle the slum residents.
The US and European governments additionally created a procedure by which the poor could directly apply to the government for housing assistance, thus becoming a partner to identifying and meeting the housing needs of its citizens. One historically effective approach to reduce and prevent slums has been city wide infrastructure development combined with affordable, reliable public mass transport and public housing projects.
In Brazil, in 2014, the government built about 2 million houses around the country for lower income families. The public program was named "Minha casa, minha vida" which means "My house, my life" The project has built 2 million popular houses and it has 2 million more under construction.
However, slum relocation in the name of urban development is criticized for uprooting communities without consultation or consideration of ongoing livelihood. For example, the Sabarmati Riverfront Project, a recreational development in Ahmedabad, India, forcefully relocated over 19,000 families from shacks along the river to 13 public housing complexes that were an average of 9 km away from the family's original dwelling.
Slums exist in many countries and have become a global phenomenon. A UN-Habitat report states that in 2006 there were nearly 1 billion people settling in slum settlements in most cities of Latin America, Asia, and Africa, and a smaller number in the cities of Europe and North America. In 2012, according to UN-Habitat, about 863 million people in the developing world lived in slums. Of these, the urban slum population at mid-year was around 213 million in Sub-Saharan Africa, 207 million in East Asia, 201 million in South Asia, 113 million in Latin America and Caribbean, 80 million in Southeast Asia, 36 million in West Asia, and 13 million in North Africa. Among individual countries, the proportion of urban residents living in slum areas in 2009 was highest in the Central African Republic (95.9%), Chad (89.3%), Niger (81.7%), and Mozambique (80.5%).
The distribution of slums within a city varies throughout the world. In most of the developed countries, it is easier to distinguish the slum-areas and non-slum areas. In the United States, slum dwellers are usually in city neighborhoods and inner suburbs, while in Europe, they are more common in high rise housing on the urban outskirts. In many developing countries, slums are prevalent as distributed pockets or as urban orbits of densely constructed informal settlements. In some cities, especially in countries in Southern Asia and sub-Saharan, slums are not just marginalized neighborhoods holding a small population; slums are widespread, and are home to a large part of urban population. These are sometimes called slum cities.
The percentage of developing world's urban population living in slums has been dropping with economic development, even while total urban population has been increasing. In 1990, 46 percent of the urban population lived in slums; by 2000, the percentage had dropped to 39%; which further dropped to 32% by 2010.
Variations of impoverished settlements
Organizations and concepts
- What are slums and why do they exist? UN-Habitat, Kenya (April 2007)
- UN-HABITAT 2007 Press Release on its report, "The Challenge of Slums: Global Report on Human Settlements 2003".
- Lawrence Vale (2007), From the Puritans to the Projects: Public Housing and Public Neighbors, Harvard University Press, ISBN 978-0674025752
- Back to back housing, courts, and privies: the slums of 19th century England J.R. Ashton, Journal Epidemiol Community Health 2006; Volume 60, Issue 8, pages 654
- Slums: Past, Present and Future United Nations Habitat (2007)
- The challenge of slums – Global report on Human Settlements, United Nations Habitat (2003)
- "State of the World's Cities Report 2012/2013: Prosperity of Cities" (PDF). UNHABITAT. Retrieved 4 October 2013.
- Mike Davis, Planet of Slums [« Le pire des mondes possibles : de l'explosion urbaine au bidonville global »], La Découverte, Paris, 2006 (ISBN 978-2-7071-4915-2)
- 5 Biggest Slums in the World, International Business Times, Daniel Tovrov, IB Times (December 9, 2011)
- Craig Glenday (Editor), Guinness World Records 2013, Bantam, ISBN 978-0-345-54711-8; see page 277
- Patton, C. (1988). Spontaneous shelter: International perspectives and prospects, Philadelphia: Temple University Press
- Assessing Slums in the Development Context United Nations Habitat Group (2011)
- Slum Dwellers to double by 2030 UN-HABITAT report, April 2007.
- Local Government Actions to Reduce Poverty and Achieve The Millennium Development Goals, Mona Serageldin, Elda Solloso, and Luis Valenzuela, Global Urban Development Magazine, Vol 2, Issue 1 (March 2006)
- Slum Etymology Dictionary, Douglas Harper (2001)
- SLUMS OF THE WORLD: THE FACE OF URBAN POVERTY IN THE NEW MILLENNIUM?, ISBN 92-1-131683-9, UN-Habitat; page 30
- Unearthing Manchester's Victorian slums Mike Pitts, The Guardian (August 27, 2009)
- The History of Council Housing University of the West of England, Bristol (2008)
- Eckstein, Susan. 1990. Urbanization Revisited: Inner-City Slum of Hope and Squatter Settlement of Despair. World Development 18: 165–181
- Encyclopedia of the City (2005), Editor: Roger W. Caves, ISBN 978-0415252256, (page 410); also see Encyclopedia Britannica (2001), article on Slum
- Dyos, H.J.; Cannadine, David; Reeder, David (1982). 131 Exploring the urban past: essays in urban history. Cambridge University Press. ISBN 978-0-521-28848-4.
- Ward, Wilfrid Philip (2008). The Life and Times of Cardinal Wiseman, Volume 1. BiblioBazaar. p. 568. ISBN 978-0-559-68852-2.
- Dyos, H.J.; Cannadine, David; Reeder, David (1982). Exploring the urban past: essays in urban history. Cambridge University Press. p. 240. ISBN 978-0-521-28848-4.
- Wohl, Anthony S. (2002). The eternal slum: housing and social policy in Victorian London. Transaction Publishers. p. 5. ISBN 978-0-7658-0870-7.
- Toronto Culture – Exploring Toronto's past – The First Half of the 20th Century, 1901–51 City of Toronto, Canada (2011)
- "Remembering St. John's Ward: The Images of Toronto City Photographer, Arthur S. Goss". Retrieved 23 July 2015.
- Nancy Krieger, Historical roots of social epidemiology, Int. Journal Epidemiol. (2001) 30 (4): 899–900
- Ann-Louise Shapiro (1985), Housing the Poor of Paris, 1850–1902, ISBN 978-0299098803
- 10 idées reçues sur les HLM, Union sociale pour l'habitat, February 2012
- France – public housing European Union
- Ordering the Disorderly Slum – Standardizing Quality of Life in Marseille Tenements and Bidonvilles Minayo Nasiali, Journal of Urban History November 2012 vol. 38 no. 6, 1021–1035
- Livret A rate falls to 1.25% The Connexion (July 18, 2013)
- The First Slum in America Kevin Baker, The New York Times (September 30, 2001)
- Solis, Julia. New York Underground: The Anatomy of a City. p. 76.
- Suttles, Gerald D. 1968. The Social Order of the Slum. Chicago: University of Chicago Press
- Gans, Herbert J. 1962. The Urban Villagers. New York: The Free Press
- HISTORY OF US PUBLIC HOUSING Affordable Housing Institute, United States (2008); See Part 1, 2 and 3
- Rosemary Wakeman, The Heroic City: Paris, 1945–1958, University of Chicago Press, ISBN 978-0226870236; see pages 45–61
- Courgey (1908), Recherche et classement des anormaux: enquête sur les enfants des Écoles de la ville d’Ivry-sur-Seine, International Magazine of School Hygiene, Ed: Sir Lauder Brunton, 395–418
- "Cités de transit": the urban treatment of poverty during decolonisation Muriel Cohen & Cédric David, Metro Politiques (March 28, 2012)
- Le dernier bidonville de Nice Pierre Espagne, Reperes Mediterraneens (1976)
- Janice Perlman (1980), The Myth of Marginality: Urban Poverty and Politics in Rio de Janeiro; University of California Press, ISBN 978-0520039520; pages 12–16
- "International Medical Corps - International Medical Corps". Retrieved 23 July 2015.
- Participating countries
- Machetes, Ethnic Conflict and Reductionism The Dominion
- Brazil: The Challenges in Becoming an Agricultural Superpower Geraldo Barros, Brookings Institution (2008)
- Urban Poverty – An Overview Judy Baker, The World Bank (2008)
- Tjiptoherijanto, Prinjono, and Eddy Hasmi. "Urbanization and Urban Growth in Indonesia." Asian Urbanization in the New Millennium. Ed. Gayl D. Ness and Prem P. Talwar. Singapore: Marshall Cavendish Academic, 2005., page 162
- Todaro, Michael P. (1969). "A Model of Labor Migration and Urban Unemployment in Less Developed Countries". The American Economic Review. 59 (1): 138–148.
- Craster, Charles V (1944). "American Journal of Public Health and the Nations Health". Slum Clearance. The Newark Plan. 34 (9): 935–940. doi:10.2105/ajph.34.9.935.
- Ali, Mohammed Akhter; Kavita Toran (2004). "Migration, Slums and Urban Squalor – A case study of Gandhinagar Slum". Proceedings of the Third International Conference on Environment and Health: 1–10.
- Davis, Mike (2006). Planet of Slums. Verso.
- State of the world population 2007: unleashing the potential of urban growth. New York: United Nations Population Fund. 2007.
- Hammel, Eugene A. (1964). "Some characteristics of rural village and urban slum populations on the coast of Peru". Southwestern Journal of Anthropology: 346–358.
- Patel, Ronak B.; Thomas F. Burke (2009). "Urbanization—an emerging humanitarian disaster". New England Journal of Medicine. 361 (8): 741–743. doi:10.1056/nejmp0810878.
- Bolay, Jean-Claude (2006). "Slums and urban development: questions on society and globalisation". The European Journal of Development Research. 18 (2): 284–298. doi:10.1080/09578810600709492.
- Firdaus, Ghuncha (2012). "Urbanization, emerging slums and increasing health problems: a challenge before the nation: an empirical study with reference to state of uttar pradesh in India". Journal of Environmental Research and Management. 3 (9): 146–152.
- Clonts, Howard A. (1970). "Influence of urbanization on land values at the urban periphery". Land Economics. 46 (4): 489–497.
- UN-HABITAT (2003b) The Challenge of Slums: Global Report on Human Settlements. Earthscan, London: UN-Habitat. 2003.
- Wekwete, K. H (2001). "Urban management: The recent experience, in Rakodi, C.". The Urban Challenge in Africa.
- Cheru, F (2005). Globalization and uneven development in Africa: The limits to effective urban governance in the provision of basic services. UCLA Globalization Research Center-Africa.
- Slums as Expressions of Social Exclusion: Explaining the Prevalence of Slums in African Countries Ben Arimah, United Nations Human Settlements Programme, Nairobi, Kenya
- Rancich, Michael T. (1970). "Land value changes in an area undergoing urbanization". Land Economics. 46 (1): 32–40.
- Alonso-Villar, Olga (2001). "Large Metropolises in the Third World: An Explanation.". Urban Studies. 38 (8): 1368. doi:10.1080/00420980120061070.
- Istanbul's Gecekondus Orhan Esen, London School of Economics and Political Science (2009)
- United Nations (2000). "United Nations Millennium Declaration" (PDF). United nations millennium summit.
- Choguill, Charles L. (2007). "The search for policies to support sustainable housing". Habitat International. 31 (1): 143–149. doi:10.1016/j.habitatint.2006.12.001.
- Scourge of slums The Economist (July 14, 2012)
- Walther, James V. (1965). "Cause or Effect of Slums?". Challenge. 13 (14): 24–25.
- Ooi, Giok Ling; Kai Hong Phua. "Urbanization and slum formation". Journal of Urban Health (1): 27–34.
- Jan Nijman, A STUDY OF SPACE IN MUMBAI'S SLUMS, Tijdschrift voor economische en sociale geografie Volume 101, Issue 1, pages 4–17, February 2010
- Sharma, K. (2000). Rediscovering Dharavi: stories from Asia's largest slum. Penguin, ISBN 978-0141000237, pages 3–11
- Pacione, Michael (2006), Mumbai, Cities, 23(3), pages 229–238
- Obudho, R. A.; G. O. Aduwo (1989). "Slum and squatter settlements in urban centres of Kenya: Towards a planning strategy". Journal of Housing and the Built Environment. 4 (1): 17–30. doi:10.1007/bf02498028.
- Liora Bigon, Between Local and Colonial Perceptions: The History of Slum Clearances in Lagos (Nigeria), 1924–1960, African and Asian Studies, Volume 7, Number 1, 2008, pages 49–76 (28)
- Beinart, W., & Dubow, S. (Eds.), (2013), Segregation and apartheid in twentieth century South Africa, Routledge, pages 25–35
- Griffin, E., and Ford, L. (1980), A model of Latin American city structure, Geographical Review, pages 397–422
- Marcuse, Peter (2001), Enclaves yes, ghettoes, no: Segregation and the state, Lincoln Institute of Land Policy Conference Paper, Columbia University
- Bauman, John F (1987), Public Housing, Race, and Renewal: Urban Planning in Philadelphia, 1920–1974, Philadelphia, Temple University Press
- Destroying Makoko The Economist (August 18, 2012)
- Africa: Improved infrastructure key to slum upgrading – UN Official IRIN, United Nations News Service (11 June 2009)
- LATIN AMERICAN SLUM UPGRADING EFFORTS Elisa Silva, Arthur Wheelwright Traveling Fellowship 2011, Harvard University
- The Challenge of Slums: Global Report on Human Settlements (2003), United Nations Human Settlements Programme; ISBN 1-84407-037-9
- Growing out of poverty: Urban job Creation and the Millennium Development Goals Marja Kuiper and Kees van der Ree, Global Urban Development Magazine, Vol 2, Issue 1, March 2006
- "The Informal Economy: Fact Finding Study" (PDF). Department for Infrastructure and Economic Cooperation. Retrieved 20 November 2011.
- Towards a better understanding of informal economy Dan Andrews, Aida Caldera Sánchez, and Åsa Johansson, OECD France (30 May 2011)
- The state of world’s cities UN Habitat (2007)
- The Urban Informal Sector in Nigeria Geoffrey Nwaka, Global Urban Development Magazine, Vol 1, No 1 (May 2005)
- In nairobi’s slums, problems and potential as big as Africa itself Sam Sturgis, Rockefeller Foundation, (January 3, 2013)
- In one slum, misery, work, politics and hope Jim Yardley, New York Times (December 28, 2011)
- Minnery et al., Slum upgrading and urban governance: Case studies in three South East Asian cities, Habitat International, Volume 39, July 2013, Pages 162–169
- SLUMS OF THE WORLD: THE FACE OF URBAN POVERTY IN THE NEW MILLENNIUM?, ISBN 92-1-131683-9, UN-Habitat
- The case of São Paulo, Brazil – Slums Mariana Fix, Pedro Arantes and Giselle Tanaka, Laboratorio de Assentamentos Humanos de FAU-USP, Sao Paolo, pages 15–20
- Bid to develop Indian slum draws opposition Philip Reeves, National Public Radio (Washington DC), May 9, 2007
- Slum banged Joshi and Unnithan, India Today (March 7, 2005)
- An Inventory of the Slums in Nairobi Irene Wangari Karanja and Jack Makau, IRIN, United Nations News Service (2010); page 10-14
- Gerald Suttles (1970),The Social Order of the Slum: Ethnicity and Territory in the Inner City, ISBN 978-0226781921, University of Chicago Press, see Chapter 1
- Bright City Lights and Slums of Dhaka city Ahsan Ullah, City University of Hong Kong (2002)
- Slums – Summary of City Case Studies UN Habitat, page 203
- Slums: The case of Beirut, Lebanon, Mona Fawaz and Isabelle Peillen, Massachusetts Institute of Technology (2003)
- Fleeing war, finding misery The plight of the internally displaced in Afghanistan Amnesty International (February 2012); page 9-12
- Slum upgrading – Why do slums develop Cities Alliance (2011)
- Three years after Haiti earthquake, loss of hope, desperation Jacqueline Charles, Miami Herald (January 8, 2013)
- Slum eviction plans in Haiti spark protests The Telegraph (United Kingdom), July 25, 2012
- Bangladesh cyclone: Rebuilding after Cyclone Sidr Habitat for Humanity International (May 6, 2009)
- Rosa Flores Fernandez (2011), Physical and Spatial Characteristics of Slum Territories Vulnerable to Natural Disasters, Les Cahiers d’Afrique de l’Est, n° 44, French Institute for Research in Africa
- Banerji, M. (2009), Provision of basic services in the slums and resettlement colonies of Delhi, Institute of Social Studies Trust
- Lloyd, P. (1979), Slums of Hope: shanty towns of the Third World, Manchester University Press, ISBN 978-0719007071
- McAuslan, Patrick. (1986). Les mal logés du Tiers-Monde. Paris: Éditions L’Harmattan
- Centre des Nations Unies pour les Etablissements Humains (CNUEH). (1981). Amélioration physique des taudis et des bidonvilles, Nairobi
- Gilbert, Daniel (1990), Barriada Haute-Espérance : Récit d’une coopération au Pérou. Paris: Éditions Karthala
- Agbola, Tunde; Elijah M. Agunbiade (2009). "Urbanization, Slum Development and Security of Tenure- The Challenges of Meeting Millennium Development Goal 7 in Metropolitan Lagos, Nigeria.". Urban Population–Development–Environment Dynamics in the Developing World- Case Studies and Lessons Learned: 77–106.
- Brueckner, Jan K.; Harris Selod (2009). "A theory of urban squatting and land-tenure formalization in developing countries". American Economic Journal: Economic Policy: 28–51.
- Davy, Ben; Sony Pellissery (2013). "The citizenship promise (un) fulfilled: The right to housing in informal settings.". International Journal of Social Welfare. 22 (S1): 68–84.
- Flood, Joe (2006). "Secure Tenure Survey Final Report". Urban Growth Management Initiative.
- Taschner, Suzana (2001), Desenhando os espaços da pobreza. Faculdade de Arquitetura e Urbanismo, Université de Sao Paulo
- Field, E. (2005). Property rights and investment in urban slums. Journal of the European Economic Association, 3(2‐3), 279–290
- Davis, M. (2006), Planet of slums, New Perspectives Quarterly, 23(2), 6–11
- Ravetz, A. (2013). The government of space: town planning in modern society. Routledge
- Ratcliff, R. U. (1945). Filtering down and the Elimination of Substandard Housing. The Journal of Land & Public Utility Economics, 21(4), 322–330
- Kristof, F. S. (1965). Housing policy goals and the turnover of housing. Journal of the American institute of planners, 31(3), 232–245
- Mandelker, D. R. (1969). Housing Codes, Building Demolition, and Just Compensation: A Rationale for the Exercise of Public Powers Over Slum Housing. Michigan Law Review, 67(4), 635–678
- United Nations Human Settlements Programme, The challenge of slums: global report on human settlements 2003, London and Sterling, Earthscan Publications Ltd; 2003; ISBN 1-84407-037-9
- Kimani-Murage, E. W., & Ngindu, A. M. (2007). Quality of water the slum dwellers use: the case of a Kenyan slum. Journal of Urban Health, 84(6), 829–838
- Garside, P. L. (1988). ‘Unhealthy areas’: Town planning, eugenics and the slums, 1890–1945. Planning Perspectives, 3(1), 24–46
- Wohl, A. S. (1977). The Eternal Slum: Housing and Social Policy in Victorian (Vol. 5). Transaction Books.
- Kundu N (2003) Urban slum reports: The case of Kolkata, India. Nairobi: United Nations
- Integrated Water Sanitation and Waste Management in Kibera United Nations (2008)
- Kenya Slum Upgrading Project United Nations Habitat (2011)
- Slums in Romania Cristina Iacoboaea (2009), TERUM, No 1, Vol 10, pages 101–113
- Growth of Slums, Availability of Infrastructure and Demographic Outcomes in Slums: Evidence from India S Chandrasekhar (2005), Urbanization in Developing Countries at the Population Association of America, Philadelphia
- Matt Birkinshaw, Abahlali baseMjondolo Movement SA. August 2008. Big Devil in the Jondolos: The Politics of Shack Fires.
- Subbaraman et al (2012). Off the map: the health and social implications of being a non-notified slum in India. Environment and urbanization, 24(2), pages 643–663
- Nuijten, M., Koster, M., & de Vries, P. (2012). Regimes of spatial ordering in Brazil: neoliberalism, leftist populism and modernist aesthetics in slum upgrading in Recife. Singapore Journal of Tropical Geography, 33(2), pages 157–170
- Gulyani, S., Talukdar, D., & Jack, D. (2010). Poverty, living conditions, and infrastructure access: a comparison of slums in Dakar, Johannesburg, and Nairobi. World Bank Policy Research Working Paper No. 5388
- Giok Ooi and Kai Phua, Urbanization and Slum Formation, Journal of Urban Health. 2007 May; 84 (Suppl 1): pages 27–34
- Slums of Urban Bangladesh: Mapping and Census, 2005.
- Rio slum landslide leaves hundreds dead The Guardian (8 April 2010)
- Dilley, M. (2005). Natural disaster hotspots: a global risk analysis (Vol. 5). World Bank Publications
- Smith, Keith (2013). Environmental hazards: assessing risk and reducing disaster, Routledge, ISBN 978-0415681056
- Wisner, B. (Ed.). (2004). At risk: natural hazards, people's vulnerability and disasters. Psychology Press, ISBN 978-0415252157
- Sanderson, D. (2000), Cities, disasters and livelihoods, Environment and Urbanization, 12(2), pages 93–102
- Pelling, M., & Wisner, B. (Eds.). (2009), Disaster risk reduction: Cases from urban Africa, Earthscan Publishers (UK); ISBN 978-1-84407-556-0
- "3 dead as massive fire breaks out at outer Delhi slum". Retrieved 23 July 2015.
- "Photos: Manila slum fire leaves more than 1,000 homeless". Retrieved 23 July 2015.
- Hamza, M., & Zetter, R. (1998). Structural adjustment, urban systems, and disaster vulnerability in developing countries. Cities, 15(4), pages 291–299
- Gupta, Indrani; Arup Mitra (2002). "Rural migrants and labour segmentation: Micro-level evidence from Delhi slums.". Economic and Political Weekly: 163–168.
- Slum residence World Heath Organization (2010)
- Taj Ganj Slum Housing, Cities Alliance (2012)
- The hidden role of informal economy Ulla Heinonen, Helsinki University of Technology, Finland (2008); ISBN 978-951-22-9102-1
- The case of Karachi, Pakistan Urban Slum Reports, A series on Slums of the World (2011); see page 13
- How New York City Sold Public Housing Mark Byrnes, The Atlantic (November 2, 2011)
- Uganda: slum areas, posh pubs biggest drug hubs All Africa News (January 7, 2013)
- "African Moonshine: Kill Me Quickly". The Economist. 2010-04-29.
- Larry Whiteaker (1997), Seduction, Prostitution, and Moral Reform in New York, 1830–1860, ISBN 978-0815328735, page 29
- Vanda Felbab-Brown, Bringing the State to the Slum: Confronting Organized Crime and Urban Violence in Latin America – Lessons for Law Enforcement and Policymakers Brookings Institution (December 2011)
- Breman, J. (2003). The labouring poor in India: Patterns of exploitation, subordination, and exclusion. New Delhi: Oxford University Press.
- Kabiru, C. W.; et al. (2012). ""Making It": understanding adolescent resilience in two informal settlements (Slums) in Nairobi, Kenya". Child & Youth Services. 33 (1): 12–32. doi:10.1080/0145935x.2012.665321.
- In the Violent Favelas of Brazil S Mehta, The New York Review of Books (August 2013)
- Venezuela’s military enters high crime slums Karl Ritter, Associated Press (May 17, 2013)
- Newar, Rachel (14 June 2013). "In Kenya, Where One in Four Women has Been Raped, Self Defense Training Makes a Difference". Smithsonian Magazine. Retrieved 6 November 2013.
- Global: Urban conflict – fighting for resources in the slums IRIN, United Nations News Service (October 8, 2007)
- Josephine Slater (2009), Naked C
- Bringing the State to the Slum: Confronting Organized Crime and Urban Violence in Latin America Vanda Felbab-Brown (2011), Brookings Institution
- Go, Vivian F.; et al. (2003). "When HIV-prevention messages and gender norms clash: the impact of domestic violence on women's HIV risk in slums of Chennai, India". AIDS and Behavior. 7 (3): 263–272.
- Magar, Veronica (November–December 2003). "Empowerment approaches to gender-based violence: women's courts in Delhi slums". Women's Studies International Forum. Elsevier. 26 (6): 509–523. doi:10.1016/j.wsif.2003.09.006.
- Women, Slums and Urbanisation:Examining the Causes and Consequences. Geneva: Centre on Housing Rights and Evictions (COHRE). 2008. ISBN 978-92-95004-42-9.
- Palus, Nancy. "Humanitarian intervention in violence-hit slums – from whether to how". IRIN. Retrieved 1 Nov 2013.
- More Slums Equals More Violence Robert Muggah and Anna Alvazzi del Frate, Geneva Declaration on Armed Violence and Development & UNDP (October 2007)
- Outwater, A.; et al. (2005). "Homicide Death in Sub-Saharan Africa: A Review 1970–2004". African Safety Promotion. 8.
- LeBas, A. (2013), Violence and urban order in Nairobi, Kenya and Lagos, Nigeria, Studies in Comparative International Development, 48(3), pp 240-262
- Rashid, S.F. (2005). "Worried lives, poverty and reproductive health needs of married adolescent women in urban slums of Dhaka city, Bangladesh". Doctoral Dissertation, The Australian National University.
- Ochako, Rhoune Adhiambo; et al. (2011). "Gender-Based Violence in the Context of Urban Poverty: Experiences of Men from the Slums of Nairobi, Kenya". Population Association of America 2011 Annual Meeting Program.
- R Merton (1938), Social Structure and anomie, American Sociological Review, 3, pages 672-682
- S Cohen (1971), Images of deviance, Harmondsworth, UK, Penguin
- Criminological Theory: Context and Consequences, J. Robert Lilly, Francis T. Cullen, Richard A. Ball (2010), 5th Edition, SAGE, ISBN 978-1412981453, pages 41-69
- Global: Urban conflict - fighting for resources in the slums IRIN, United Nations News Service (October 8, 2007)
- Josephine Slater (2009), Naked Cities - Struggle in the Global Slums, Mute, Volume 2, Issue 3, ISBN 0-9550664-3-3
- Desai, V.K.; el al. (2003). "Study of measles incidence and vaccination coverage in slums of Surat city". Indian Journal of Community Medicine. 28 (1).
- Nossiter, Adam. "Cholera Epidemic Envelops Coastal Slums in West Africa". New York Times. Retrieved 20 Nov 2013.
- Cholera epidemic envelops coastal slums in West Africa, Africa Health, page 10 (September 2012)
- Are slum dwellers at heightened risk of HIV infection than other urban residents? Evidence from population-based HIV prevalence surveys in Kenya Nyovani Madise et al., Health Place. 2012 September; 18(5): 1144–1152
- Burns, P. A., & Snow, R. C. (2012). The built environment & the impact of neighborhood characteristics on youth sexual risk behavior in Cape Town, South Africa. Health & Place, 18(5), 1088–1100
- MEASLES OUTBREAK – A STUDY IN MIGRANT POPULATION IN ALIGARH Najam Khalique et al, Indian J. Prev. Soc. Med. Vol. 39 No.3& 4 2008
- Bhattacharya, S. K., Sur, D., Dutta, S., Kanungo, S., Ochiai, R. L., Kim, D. R., ... & Deen, J. (2013). Vivax malaria and bacteraemia: a prospective study in Kolkata, India. Malaria journal, 12(1), 176–178
- Alzahrani, A.G. et al. (2013). Geographical distribution and spatio-temporal patterns of dengue cases in Jeddah Governorate from 2006–2008. Transactions of The Royal Society of Tropical Medicine and Hygiene, 107(1), 23–29
- Corner, R. J., Dewan, A. M., & Hashizume, M. (2013). Modelling typhoid risk in Dhaka Metropolitan Area of Bangladesh: the role of socio-economic and environmental factors. International journal of health geographics, 12(1), 13.
- Socio-demographic determinants and prevalence of Tuberculosis knowledge in three slum populations of Uganda Ekwaro Obuku et al, BMC Public Health 2012, 12:536
- India: Battling TB in India’s slums The World bank (May 9, 2013)
- Victoriano, A. et al. (2009). Leptospirosis in the Asia Pacific region. BMC Infectious Diseases, 9(1), 147
- Sampaio et al, (2010), Risk factors for death in children with visceral leishmaniasis, PLoS neglected tropical diseases, 4(11), e877
- Sur, Dipika; et al. (2005). "The burden of cholera in the slums of Kolkata, India: data from a prospective, community based study". Archives of Disease in Childhood. 90 (11): 1175–1181. doi:10.1136/adc.2004.071316.
- Deen, Jacqueline L.; et al. (2008). "The high burden of cholera in children: comparison of incidence from endemic areas in Asia and Africa". PLoS neglected tropical diseases. 2 (2): 173. doi:10.1371/journal.pntd.0000173.
- Ghosh, Jayati; et al. (2009). "Vulnerability to HIV/AIDS among women of reproductive age in the slums of Delhi and Hyderabad, India". Social Science & Medicine. 68 (4): 638–642. doi:10.1016/j.socscimed.2008.11.023.
- Odek, Willis Omondi; et al. (2009). "Effects of micro-enterprise services on HIV risk behaviour among female sex workers in Kenya's urban slums". AIDS and Behavior. 13 (3): 449–461. doi:10.1007/s10461-008-9485-y.
- Piot, P. (2001). "A gendered epidemic: Women and the risks and burdens of HIV". Journal of the American Medical Women's Association. 56: 90–91.
- Kyobutungi, Catherine; et al. (2008). "The burden of disease profile of residents of Nairobi's slums: Results from a Demographic Surveillance System". Population Health Metrics. 6 (1).
- World Health Organization (2004). Water, Sanitation and Hygiene Links to Health: Facts and Figures.
- Sharma, Rashmi; et al. (2009). "Assessment of immunization status in the slums of surat by 15 clusters multi indicators cluster survey technique". Indian Journal of Community Medicine. 34 (2): 152. doi:10.4103/0970-0218.51222.
- Riley, Lee W.; et al. (2007). "Slum health: diseases of neglected populations". BMC International Health and Human Rights. 7 (1).
- Adult mortality in slums of Karachi, Pakistan David Marsh, JPMA (2010)
- Zaidi, S.S.; et al. (2006). "Health care utilization for diarrhea and fever in 4 urban slums in Karachi". Journal of the College of Physicians and Surgeons—Pakistan: JCPSP. 16 (4).
- Mehta, Varshil; Mehta, Sonali (2016). "Assessment of HIV knowledge and awareness in adults of a slum area of Mumbai, India: a cross-sectional study". International Journal of Community Medicine and Public Health: 314–318. doi:10.18203/2394-6040.ijcmph20151583.
- Mehta, Varshil (2015). "Assessment of Knowledge, Attitude and Awareness of Diabetes Mellitus in Adults of a Slum Area of Mumbai, India: A Cross-Sectional Study". Indian Journal of Applied Research. 5 (12): 270–272. doi:10.15373/2249555X.
- Ghosh, S.; Shah D. (2004). "Nutritional problems in urban slum children". Indian Pediatr. 41 (7): 682–96.
- Dasra. "Nourishing our Future: Tackling Child Malnutrition in Urban Slums".
- Tada, Yuko; et al. (2002). "Nutritional status of the preschool children of the Klong Toey slum, Bangkok". Southeast Asian Journal of Tropical Medicine and Public Health. 33 (3): 628–637.
- United Nations Human Settlements Programme (2006). State of the world's cities 2006/7. London: Earthscan Publications.
- Karim, Md Rezaul (11 Jan 2012). "Children suffering malnutrition in a slum". Wikinut-guides-activism.
- Punwani, Jyoti (Jan 10, 2011). "Malnutrition kills 56,000 children annually in urban slums". The Times of India.
- Gomber, Sunil; et al. (2003). "Prevalence & etiology of nutritional anaemia among school children of urban slums". Indian J Med Res. 118: 167–171.
- Mehta, Varshil; Bhat, Anusha (2015). "Health awareness and behavior among adolescent students in a rural school: a cross sectional observational study". International Journal of Research in Medical Sciences: 3499–3502. doi:10.18203/2320-6012.ijrms20151231.
- Reiter, P., & Goh, K. T. (1998), Dengue control in Singapore, Dengue in Singapore, pp. 213-242, ISBN 981-04-0164-7
- Swaminathan, M. (1995). Aspects of urban poverty in Bombay. Environment and Urbanization, 7(1), pp 133-144
- Sclar ED, Garau P, Carolini G (2005), The 21st century health challenge of slums and cities, Lancet, 365(9462):901-903
- In a Liberian slum swarming with Ebola, a race against time to save two little girls The Washington Post
- Liberian Slum Takes Ebola Treatment Into Its Own Hands The Wall Street Journal
- Thomas Quinn and John Bartlett, (2010), Global infectious diseases and urbanization, Urban Health: Global Perspectives, 18, 105; ISBN 978-0-470-42206-9
- Alirol E. et al. (2011). Urbanisation and infectious diseases in a globalised world, The Lancet infectious diseases, 11(2), 131–141
- Adam Parsons (2010), The Seven Myths of Slums: Challenging popular prejudices about the world’s urban poor, ISBN 978-1-907121-02-9; page 14
- Slum dwellers refuse to vacate railway land, The Dawn, Rawalpindi, Pakistan (August 24, 2013)
- Homeless labourers protest razing of slums The Hindustan Times, Gurgaon, India (April 21, 2013)
- Gardiner, B. (1997), Squatters' Rights and Adverse Possession: A Search for Equitable Application of Property Laws. Ind. Int'l & Comp. L. Rev., 8, 119
- Kross, E. (1992). Spontaneous settlements in Lima: urbanization processes in a Latin American metropolis, Ferdinand Schoningh. ISBN 3-506-71265-9
- Stephen K. Mayo, Stephen Malpezzi and David J. Gross, Shelter Strategies for the Urban Poor in Developing Countries, The World Bank Research Observer, Vol. 1, No. 2 (Jul., 1986), pages 183–203
- William Mangin, Latin American Squatter Settlements: A Problem and a Solution, Latin American Research Review, Vol. 2, No. 3 (Summer, 1967), pages 65–98
- Nyametso, J. K. (2012, September). Resettlement of slum dwellers, land tenure security and improved housing, living and environmental conditions at Madina Estate, Accra, Ghana, In Urban Forum (Vol. 23, No. 3, pages 343–365). Springer Netherlands
- Upgrading Urban Communities, The World Bank, MIT (2009)
- Ton Van Naerssen, Squatter Access to Land in Metro Manila, Philippine Studies vol. 41, no. 1 (1993); pages 3–20
- Arandel, C., & Wetterberg, A. (2013). Between "Authoritarian" and "Empowered" slum relocation: Social mediation in the case of Ennakhil, Morocco. Cities, 30, pages 140–148
- TURNER, J. F. C. and FICHTER, R. (Eds) (1972) Freedom to Build. New York: Macmillan
- TURNER, J. F. C. (1996) Tools for building community: an examination of 13 hypotheses, HABITAT International, 20, see pages 339–347
- What is Urban Upgrading The World Bank Group, MIT (2009)
- Werlin, Herbert (August 1999). "The Slum Upgrading Myth". Urban Studies. 36 (9): 1523. doi:10.1080/0042098992908. Cite error: Invalid
<ref>tag; name "werlin" defined multiple times with different content (see the help page).
- Werlin, Herbert (August 1999). "The Slum Upgrading Myth". Urban Studies. 36 (9): 1524. doi:10.1080/0042098992908.
- Tondo Urban Development Project MIT (2009)
- Fernando Patino,Urban Safety through Slum Upgrading United Nations Habitat (2011); ISBN 978-9211323931; see pages 7–19
- World Bank Experience with the Provision of Infrastructure Services for the Urban Poor Christine Kessides] The World Bank (1997)
- LUNA, E. M., FERRER, O. P. and IGNACIO, JR., U. (1994) Participatory Action Planning for the Development of Two PSF Projects. Manila: University of Philippines
- BARTONE, C., BERNSTEIN, J., LEITMANN, J. and Eigen, J. (1994) Toward Environmental Strategies for Cities. Washington, DC: World Bank
- BANNERJEE, T. and CHAKROVORTY, S. (1994) Transfer of planning technology and local political economy: a retrospective analysis of Calcutta, Journal of the American Planning Association, 60, pages 71–82
- Martijn Koster, & Monique Nuijten (2012), From Preamble to Post‐project Frustrations: The Shaping of a Slum Upgrading Project in Recife, Brazil. Antipode, 44 (1), pages 175–196
- Smolka, M (2003), Informality, urban poverty, and land market prices. Land Lines 15(1)
- Kristian Buhl Thomsen (2012), Modernism and Urban Renewal in Denmark 1939–1983, Aarhus University, 11th Conference on Urban History, EAUH, Prague
- See (in Danish): Lov om Boligtilsyn og Sanering af usunde Bydele, Rigsdagstidende, 1939, pages 1250–1260
- Urban Land Tenure Policies in Brazil, South Africa, and India: an Assessment of the Issues Donald A. Krueckeberg and Kurt G. Paulsen (2000), Lincoln Institute, Rutgers University
- Marie Huchzermeyer and Aly Karam, Informal settlements: A perpetual challenge? Cape Town, SA: University of Cape Town Press
- Policy and Planning as Public Choice Mass Transit in the United States Daniel Lewis and Fred Williams, Federal Transport Agency, DOT, US Government, 1999; Ashgate
- Lessinger, J. (1962). The Case for scatteration: Some reflections on the national capital region plan for the year 2000. Journal of the American Institute of Planners, 28(3), see pages 159–169
- Public transport in Victorian London: Part Two: Underground London Transport Museum (2010)
- nycsubway.org—Historic American Engineering Record: Clifton Hood, IRT and New York City, Subway
- Before Public Housing, a City Life Cleared Away Sam Roberts, New York Times (May 8, 2005)
- The impact of post-war slum clearance in the UK Becky Tunstall and Stuart Lowe, Social Policy and Social Work, The University of York (November 2012)
- Inter-war Slum Clearance The History of Council Housing; UK
- A New Urban Vision UK’s History of Council Housing (2008)
- Rogers, D. (2013). Can infrastructure prevent a planet of slums?. Construction Research and Innovation, 4(2), 30–33
- Mathur, Navdeep (December 1, 2012). [file:///C:/Users/HarperBear/Downloads/On_the_Sabarmati_Riverfront-NavdeepMathur.pdf "On the Sabarmati Riverfront: Urban Planning as Totalitarian Governance in Ahmedabad"] Check
|url=value (help) (PDF). Economic and Political Weekly. XLVII (Nos. 47 & 48).
- Arimah, Ben C. (2010). "The face of urban poverty: Explaining the prevalence of slums in developing countries, Working paper". World Institute for Development Economics Research. 30.
- UN-HABITAT (2006b) (2006). State of the World’s Cities 2006/2007: The Millennium Development Goals and Urban Sustainability. London: Earthscan.
- Slum Cities and Cities with Slums" States of the World’s Cities 2008/2009. UN-Habitat.
- "State of the World's Cities Report 2012/2013: Prosperity of Cities" (PDF). UNHABITAT. p. 127.
|Look up slum in Wiktionary, the free dictionary.|
|Wikimedia Commons has media related to Slums.|
- Various authors (2003, revised 2010; reprint 2012). The Challenge of Slums: Global Report on Human Settlements 2003. UN-HABITAT. ISBN 978-1-1-36554-759. Retrieved 15 August 2013. Check date values in:
- Moreno, Eduardo López (2003). Slums of the World: The Face of Urban Poverty in the New Millennium?. UN-HABITAT. ISBN 978-92-1-131683-4. Retrieved 15 August 2013.
- Robert Neuwirth: Shadow Cities, New York, 2006, Routledge
- Mike Davis (scholar):Planet of Slums London, New York 2006 ISBN 1-84467-022-8
- Elisabeth Blum / Peter Neitzke: FavelaMetropolis. Berichte und Projekte aus Rio de Janeiro und São Paulo, Birkhäuser Basel, Boston, Berlin 2004 ISBN 3-7643-7063-7
- Floris Fabrizio Puppets or people? A sociological analysis of Korogocho slum, Pauline Publication Africa, Nairobi 2007.
- Floris Fabrizio ECCESSI DI CITTÀ: Baraccopoli, campi profughi, città psichedeliche, Paoline, Milano, ISBN 88-315-3318-5
- Matt Birkinshaw A Big Devil in the Jondolos: A report on shack fires by Matt Birkinshaw, 2008
- Every third person will be a slum dweller within 30 years, UN agency warns; John Vidal; The Guardian; October 4, 2003.
- Mute Magazine Vol 2#3, Naked Cities – Struggle in the Global Slums, 2006
- Cities Alliance
- Marx, Benjamin, Thomas Stoker, and Tavneet Suri. “The Economics of Slums in the Developing World.” Journal of Economic Perspectives 27, no. 4 (November 2013): 187–210.