Open plan is the generic term used in architectural and interior design for any floor plan which makes use of large, open spaces and minimizes the use of small, enclosed rooms such as private offices. The term can also refer to landscaping of housing estates, business parks, etc., in which there are no defined property boundaries, such as hedges, fences or walls.
Open-plan office designs are generally promoted as improving collaboration, but moving from cubicles to open workspaces (e.g., tables with no visual barriers) actually results in dramatically fewer face-to-face interactions among staff and reduced productivity.
In residential design, open plan or open concept (the term used mainly in Canada) describes the elimination of barriers such as walls and doors that traditionally separated distinct functional areas, such as combining the kitchen, living room, and dining room into a single great room.
Many pre-industrial huts are single-room, if small. In England in the Middle Ages, the single-room hearth-heated hall house developed into multi-room houses that became popular as the country industrialized, and more people beyond nobility could afford them.
In the 1880s, small public rooms of the home with specific functions began to be replaced by larger rooms that would fulfill multiple uses, with the kitchen, bedrooms and bathrooms still being enclosed private spaces. Larger rooms were made possible by advances in centralized heating that allowed larger spaces to be kept at comfortable temperatures.
Frank Lloyd Wright was one of the early advocates for open plan design in houses, expanding on the ideas of Charles and Henry Greene and shingle style architecture. Wright's designs were based on a centralized kitchen which opened to other public spaces of the home where the housewife would be "more hostess 'officio', operating in gracious relation to her home, instead of being a kitchen mechanic behind closed doors." Lack of dividing walls between the kitchen and combined living room/dining room became more popular in United States in the 1970s.
A home with this type of layout has one or more large, open rooms that function as multiple rooms within a single living space. The most common is a great room that combines the kitchen, dining room, and living room into one shared space. These floor plans usually work well in homes with a smaller area, while larger homes have more leeway to work with when integrating great rooms into a floor plan. The removal of interior walls increases views and allows sunlight from windows in the exterior walls to permeate throughout the house.
In the late 2010s, some people have expressed disapproval at the open concept. Complaints about open concept designs is that they make it more difficult for different people to engage in different activities, makes it difficult to hide clutter or a dirty kitchen. Walls are useful to contain noise and smells, provide privacy, and small rooms are more efficient to heat and cool (especially when kitchen appliances are in use). A follow-on trend among relatively wealth homeowners is to build a second "mess kitchen" where the actual activity of food preparation takes place, while entertaining happens in a clean kitchen that is part of the open concept space.
Development of open-plan workspace types
Prior to the 1950s open-plan offices mostly consisted of large regular rows of desks or benches where clerks, typists, or technicians performed repetitive tasks. Such designs were rooted in the work of industrial engineers or efficiency experts such as Frederick Winslow Taylor and Henry Ford. In the 1950s a German team named Quickborner developed the office landscape, which used conventional furniture, curved screens, large potted plants, and organic geometry to create work groups on large, open floors. Office landscape was quickly supplanted by office-furniture companies which developed cubicles based on panel-hung or systems furniture. Many terms (mostly derisive) have been used over time for offices using the old-style, large arrays of open cubicles.
An increase in knowledge work and the emergence of mobile technology during the late 20th-century led to an evolution in open-plan offices. Many[quantify] companies have started experimenting with designs which provide a mix of cubicles, open workstations, private offices, and group workstations. In some cases, these are not assigned to one particular individual, but are available to any employee of the company on either a reservable or "drop-in" (first come, first served) basis. Terms for this strategy include Hoteling, "alternative officing" and "hotdesking".
Michael Bloomberg used a team-oriented bullpen style – where employees can see and hear each other freely, but desks are grouped into teams – at his media company Bloomberg L.P. and for his staff while Mayor of New York City (in office: 2002–2013).
A systematic survey of research upon the effects of open-plan offices found frequent negative effects in some traditional workplaces: high levels of noise, stress, conflict, high blood pressure and a high staff turnover.
The noise level in open-plan offices greatly reduces productivity, which drops to one third relative to what it would be in quiet rooms. New technologies like voice-activation and mobile phones also decrease effectiveness in the open-plan setting.
Although promoted as a way to encourage collaboration and increase the group's collective intelligence, open-plan offices are associated with a dramatic reduction in face-to-face interactions, as employees turn to digital communication, such as sending e-mail messages. Open-plan offices have frequently been found to reduce the confidential or private conversations which employees engage in, and to reduce job satisfaction, concentration and performance, whilst increasing auditory and visual distractions.[need quotation to verify]
Open-plan offices have been found to elevate the risk of employees needing to take time off for sickness.
The interior design of open-plan offices has been found as one of the key elements where occupants' high satisfaction scores and perceived productivity were observed. A human-centred approach to design is crucial to open-plan offices, along with providing workers with a variety of space that support activities when mitigating issues in such environments 
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- Definition of open-concept at Dictionary.com
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- The Case for Rooms
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You are one third as productive in open-plan offices as in quiet rooms.
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[...] voice-activated technology and mobile phones are increasing office noise levels and decreasing the effectiveness of existing open-plan arrangements.
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