Procrastination is the avoidance of doing a task that needs to be accomplished. It is the practice of doing more pleasurable things in place of less pleasurable ones, or carrying out less urgent tasks instead of more urgent ones, thus putting off impending tasks to a later time. Sometimes, procrastination takes place until the "last minute" before a deadline. Procrastination can take hold on any aspect of life — putting off cleaning the stove, repairing a leaky roof, seeing a doctor or dentist, submitting a job report or academic assignment or broaching a stressful issue with a partner. Procrastination can lead to feelings of guilt, inadequacy, depression and self-doubt.
- 1 Prevalence
- 2 Behavioral criteria
- 3 Psychological perspective
- 4 Health perspective
- 5 Management
- 6 Negative impact
- 7 Positive impact
- 8 Correlates
- 9 See also
- 10 References
- 11 Further reading
- 12 External links
In a study of academic procrastination from the University of Vermont, published in 1984, 46% of the subjects reported that they "always" or "nearly always" procrastinate writing papers, while approximately 30% reported procrastinating studying for exams and reading weekly assignments (27.6% and 30.1% respectively). Nearly a quarter of the subjects reported that procrastination was a problem for them, regarding the same tasks. However, as many as 65% indicated that they would like to reduce their procrastination when writing papers and approximately 62% indicated the same for studying for exams and 55% for reading weekly assignments.
A 1992 study showed that "52% of surveyed students indicated having a moderate to high need for help concerning procrastination." It is estimated that 80%–95% of college students engage in procrastination, and approximately 75% consider themselves procrastinators.
In a study performed on university students, procrastination was shown to be greater on tasks that were perceived as unpleasant or as impositions than on tasks for which the student believed he or she lacked the required skills for accomplishing the task.
Gregory Schraw, Theresa Wadkins, and Lori Olafson in 2007 proposed three criteria for a behavior to be classified as academic procrastination: it must be counterproductive, needless, and delaying. Steel reviewed all previous attempts to define procrastination, and concluded in a 2007 study that procrastination is "to voluntarily delay an intended course of action despite expecting to be worse off for the delay." Sabini & Silver argued that postponement and irrationality are the two key features of procrastination. Putting a task off is not procrastination, they argue, if there are rational reasons for doing so.
An approach that integrates several core theories of motivation as well as meta-analytic research on procrastination is the temporal motivation theory. It summarizes key predictors of procrastination (expectancy, value, and impulsiveness) into a mathematical equation.
The pleasure principle may be responsible for procrastination; one may prefer to avoid negative emotions, and to delay stressful tasks. The belief that one works best under pressure provides an additional incentive to the postponement of tasks. Some psychologists cite such behavior as a mechanism for coping with the anxiety associated with starting or completing any task or decision. Piers Steel indicated in 2010 that anxiety is just as likely to get people to start working early as late, and that the focus of studies on procrastination should be impulsiveness. That is, anxiety will cause people to delay only if they are impulsive.
Traditionally, procrastination has been associated with perfectionism: a tendency to negatively evaluate outcomes and one's own performance, intense fear and avoidance of evaluation of one's abilities by others, heightened social self-consciousness and anxiety, recurrent low mood, and "workaholism." However, adaptive perfectionists— egosyntonic perfectionism—were less likely to procrastinate than non-perfectionists, while maladaptive perfectionists, who saw their perfectionism as a problem— egodystonic perfectionism—had high levels of procrastination and anxiety. In a regression analysis study of Steel in 2007 found that mild to moderate level of perfectionists typically procrastinate slightly less than others, with "the exception being perfectionists who were also seeking clinical counseling."
The Stoic philosopher Epictetus held that "Men are not moved by events but by their interpretations"  Negative coping responses of procrastinating individuals tend to be avoidant or emotional rather than task-oriented or focused on problem-solving. Emotional and avoidant coping is employed to reduce stress (and cognitive dissonance) associated with putting off intended and important personal goals. This option provides immediate pleasure and is consequently very attractive to impulsive procrastinators at their first knowledge of achievable goals. There are several emotion-oriented strategies, similar to Freudian defense mechanisms, coping styles and self-handicapping.
Coping responses of procrastinators include the following.
- Avoidance: Avoiding the location or situation where the task takes place (e.g. a graduate student avoiding driving into the university).
- Denial and trivialization: Pretending that procrastinatory behavior is not actually procrastinating, but rather a task which is more important than the avoided one, or that the essential task that should be done is not of immediate importance.
- Distraction: Engaging or immersing in other behaviors or actions to prevent awareness of the task (e.g. intensive video game playing or web browsing)
- Descending counterfactuality: Comparing a life situation with others who have it worse (e.g. "Yes, I procrastinated and got a B− in the course, but I didn't fail like one other student did.")
- Valorisation: Pointing in satisfaction to what one achieved in the meantime while one should have been doing something else.
- Blaming: Delusional attributions to external factors, such as rationalizing that the procrastination is due to external forces beyond one's control (e.g. "I'm not procrastinating, but this assignment is tough.")
- Mocking: Using humor to validate one's procrastination. The person uses slapstick or slipshod methods to criticize others' striving towards the goal as funny.
- Laziness: Procrastinating simply because one is too lazy to focus on her or his desired task.
Task- or problem-solving measures are taxing from a procrastinator's outlook. If such measures are pursued, it is less likely the procrastinator would remain a procrastinator. However, pursuing such measures requires actively changing one's behavior or situation to prevent and minimize the re-occurrence of procrastination.
In 2006, it was suggested that neuroticism has no direct links to procrastination and that any relationship is fully mediated by conscientiousness. In 1982, it had been suggested that irrationality was an inherent feature of procrastination. "Putting things off even until the last moment isn't procrastination if there is a reason to believe that they will take only that moment". Steel et al. explained in 2001, "actions must be postponed and this postponement must represent poor, inadequate, or inefficient planning".
To a certain degree it is normal to procrastinate and it can be regarded as a useful way to identify what is important, due to a lower tendency of procrastination on truly valued tasks (for most people). On the other hand, excessive procrastination can become a problem and impede normal functioning. When this happens, procrastination has been found to result in health problems, stress, anxiety, sense of guilt and crisis as well as loss of personal productivity and social disapproval for not meeting responsibilities or commitments. Together these feelings may promote further procrastination and for some individuals procrastination gets almost chronic. Such procrastinators may have difficulties seeking support due to procrastination itself, but also social stigma and the belief that task-aversion is caused by laziness, lack of willpower or low ambition. In some cases problematic procrastination might be a sign of some underlying psychological disorder, but not necessarily.
Research on the physiological roots of procrastination have been concerned with the role of the prefrontal cortex, the area of the brain that is responsible for executive brain functions such as impulse control, attention and planning. Which is consistent with the notion that procrastination is strongly related to exactly these functions, or lack of them. The prefrontal cortex also acts as a filter, decreasing distracting stimuli, from other brain regions. Damage or low activation in this area of the brain can reduce an individual's ability to filter out distracting stimuli and result in poorer organization, a loss of attention, and increased procrastination. This is similar to the prefrontal lobe's role in attention-deficit hyperactivity disorder, where it is commonly underactivated.
In a 2014 U.S. study surveying procrastination and impulsiveness in fraternal- and identical twin pairs, both traits were found to be "moderately heritable." The two traits were not separable at the genetic level (rgenetic = 1.0), meaning no unique genetic influences of either trait alone was found. The authors confirmed three constructs developed from the evolutionary hypothesis that procrastination arose as a by-product of impulsivity: "(a) Procrastination is heritable, (b) the two traits share considerable genetic variation, and (c) goal-management ability is an important component of this shared variation."
Psychologist William J. Knaus estimated that 90% of college students procrastinate. Of these students, 25% are chronic procrastinators and they are usually the ones who end up dropping out of college.
Perfectionism is a prime cause for procrastination, because demanding perfection usually results in failure. Unrealistic expectations destroy self-esteem and lead to self-repudiation, self-contempt, and widespread unhappiness. To overcome procrastination, it is essential to recognize and accept the power of failure without condemning,[better source needed] to stop focusing on faults and flaws and to set goals that are easier to achieve.
To overcome procrastination:
- Be aware of habits and thoughts that lead to procrastinating.
- Seek help for self-defeating problems such as fear, anxiety, difficulty in concentrating, poor time management, indecisiveness, and perfectionism.
- Evaluate your own goals, strengths, weaknesses, and priorities.
- Set realistic goals, and develop a personal positive link between the tasks and the concrete, meaningful goals.
- Restructure activities of daily life.
- Modify your environment for that newly gained perspective. For example, eliminate or minimize noise or distraction; put effort into relevant matters; reduce day-dreaming.
- Discipline yourself to the priorities you set.
- Motivate yourself with enjoyable activities, socializing and constructive hobbies.
- Tackle issues in small blocks of time, instead of trying to solve whole problems at once and then be intimidated.
- To prevent relapse, reinforce your pre-set goals based on needs and allow yourself to be rewarded in a balanced way for accomplished tasks.
- To prevent procrastination we use a simple little tool named "Pomodoro""Pomodoro". It was invented by Francesco Cirillo, in the early 1980's. Pomodoro is Italian for tomato. Under this technique we may use a little timer which often looks like a tomato. All we need to do is set a timer to 25 minutes, turn off all interruptions, and then focus. That's it! Most anybody can focus for 25 minutes. The only last important thing is to give yourself a little reward when we are done. A few minutes of web surfing, a cup of coffee, or a bite of chocolate, even just stretching or chatting mindlessly, allowing your brain to enjoyably change its focus for a while or whatever we feel like a reward for ourselves.
Making a plan to complete tasks in a rigid schedule format might not work for everyone. There is no hard-and-fast rule to follow such a process if it turns out to be counter-productive. Instead of scheduling, it may be better to execute tasks in a flexible, unstructured schedule which has time slots for only necessary activities.
Piers Steel suggests that better time management is a key to overcoming procrastination, including being aware of and using one's "power hours" (being a "morning person" or "night owl"). A good approach is to creatively tap one's internal circadian rhythms that are best suited for the most challenging and productive work. Steel says that it is essential to have realistic goals, to tackle one problem at a time and to cherish the "small successes". Ann McGee-Cooper says that "if we learn to balance excellence in work with excellence in play, fun, and relaxation, our lives become happier, healthier, and a great deal more creative."[better source needed]
John Perry, through his "Structured Procrastination" from a lived experience, proposes a "cheat" method as a safer approach for tackling procrastination: using a pyramid scheme to reinforce the unpleasant tasks needed to be completed, in a quasi-prioritized order. In other words, postponing tasks with a mental note that one feels to do while engaged in a work that requires their current attentional focus.
For some people, procrastination can be persistent and tremendously disruptive to everyday life. For these individuals, procrastination may be symptomatic of a psychological disorder. Procrastination has been linked to a number of negative associations, such as depression, irrational behaviour, low self-esteem, anxiety and neurological disorders such as ADHD. Others have found relationships with guilt and stress. Therefore, it is important for people whose procrastination has become chronic and is perceived to be debilitating to seek out a trained therapist or psychiatrist to see if an underlying mental health issue may be present.
With a distant deadline, procrastinators report significantly less stress and physical illness than do non-procrastinators. However, as the deadline approaches, this relationship is reversed. Procrastinators report more stress, more symptoms of physical illness, and more medical visits, to the extent that, overall, procrastinators suffer more stress and health problems.
In 2005 a study conducted by Angela Chu and Jin Nam Choi was published in the Journal of Social Psychology, in which they intended to understand task performance among procrastinators with the definition of procrastination as the absence of self-regulated performance, from the 1977 work of Ellis & Knaus. In their study they identified two types of procrastination: the traditional procrastination which they denote as passive, and active procrastination where the person finds enjoyment of a goal-oriented activity only under pressure. The study calls this active procrastination positive procrastination, as it is a functioning state in a self-handicapping environment. In addition, it was observed that active procrastinators have more realistic perceptions of time and perceive more control over their time than passive procrastinators, which is considered a major differentiator between the two types. But surprisingly, active and passive procrastinators showed similar levels of academic performance. The population of the study was college students and the majority of the sample size were women and Asian in origin. Comparisons with chronic - pathological procrastination traits were avoided.
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As noted above, procrastination is consistently found to be strongly correlated with conscientiousness, and moderately so with impulsiveness.
Though the reasons for the relationship are not clear, there also exists a relationship between procrastination and eveningness; that is, those who procrastinate more are more likely to go to sleep later and wake later. It is known that conscientiousness increases across the lifespan, as does morningness. Procrastination too decreases with age. However, even controlling for age, there still exists a relationship between procrastination and eveningness, which is yet to be explained.
Testing the hypothesis that procrastinators have less of a focus on the future due to a greater focus on more immediate concerns, college undergraduates completed several self-report questionnaires, which did indeed find that procrastinators focus less on the future. Researchers had also expected to find that procrastination would be associated with a hedonistic and "devil-may-care" perspective on the present; against their expectations, they found that procrastination was better predicted by a fatalistic and hopeless attitude towards life. This finding fits well with previous research relating procrastination and depression.
According to an Educational Science Professor, Hatice Odacı, academic procrastination is a significant problem during college years in part because many college students lack efficient time management skills in using the Internet. Also, Odacı notes that most colleges provide free and fast twenty-four-hour Internet service which some students are not usually accustomed to, and as a result of irresponsible use or lack of firewalls these students become engulfed in a world of procrastination.
"Student syndrome" refers to the phenomenon where a student will begin to fully apply himself or herself to a task only immediately before a deadline. This negates the usefulness of any buffers built into individual task duration estimates. Results from a 2002 study indicate that many students are aware of procrastination and accordingly set binding deadlines long before the date for which a task is due. These self-imposed binding deadlines are correlated with a better performance than without binding deadlines though performance is best for evenly spaced external binding deadlines. Finally, students have difficulties optimally setting self-imposed deadlines, with results suggesting a lack of spacing before the date at which results are due. In one experiment, participation in online exercises was found to be five times higher in the final week before a deadline than in the summed total of the first three weeks for which the exercises were available. Procrastinators end up being the ones doing most of the work in the final week before a deadline.
Other reasons cited on why students procrastinate include fear of failure and success, perfectionist expectations, as well as legitimate activities that may take precedence over school work, such as a job.
Procrastinators have been found to receive worse grades than non-procrastinators. Tice et al. (1997) report that more than one-third of the variation in final exam scores could be attributed to procrastination. The negative association between procrastination and academic performance is recurring and consistent. Howell et al. (2006) found that, though scores on two widely used procrastination scales were not significantly associated with the grade received for an assignment, self-report measures of procrastination on the assessment itself were negatively associated with grade.
Different findings emerge when observed and self-report procrastination are compared. Steel et al. constructed their own scales based on Silver and Sabini’s "irrational" and "postponement" criteria. They also sought to measure this behavior objectively. During a course, students could complete exam practice computer exercises at their own pace, and during the supervised class time could also complete chapter quizzes. A weighted average of the times at which each quiz was finished formed the measure of observed procrastination, whilst observed irrationality was quantified with the number of practice exercises that were left uncompleted. Researchers found that there was only a moderate correlation between observed and self-reported procrastination (r = 0.35). There was a very strong inverse relationship between the number of exercises completed and the measure of postponement (r = −0.78). Observed procrastination was very strongly negatively correlated with course grade (r = −0.87), as was self-reported procrastination (though less so, r = −0.36). As such, self-reported measures of procrastination, on which the majority of the literature is based, may not be the most appropriate measure to use in all cases. It was also found that procrastination itself may not have contributed significantly to poorer grades. Steel et al. noted that those students who completed all of the practice exercises "tended to perform well on the final exam no matter how much they delayed."
Procrastination is considerably more widespread in students than in the general population, with over 70 percent of students reporting procrastination for assignments at some point. A 2014 panel study from Germany among several thousand university students found that increasing academic procrastination increases the frequency of seven different forms of academic misconduct, i.e., using fraudulent excuses, plagiarism, copying from someone else in exams, using forbidden means in exams, carrying forbidden means into exams, copying parts of homework from others, fabrication or falsification of data and the variety of academic misconduct. This study argues that academic misconduct can be seen as a means to cope with the negative consequences of academic procrastination such as performance impairment.
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- Life skills
- Tardiness (vice)
- Attention economy
- Avoidant personality disorder
- Distributed Practice
- Passive-aggressive behavior
- Postponement of affect
- Resistance (creativity)
- Emotional self-regulation
- Attention management
- Decision making
- Temporal motivation theory
- Time management
- Trait theory
- Pomodoro Technique
- Time perception
- Work aversion
- Dunning–Kruger effect
- Restraint bias
- Empathy gap
- Egosyntonic and egodystonic
- Olpin and Hesson, 2013
- Solomon, L. J.; Rothblum, E. D. (1984). "Academic Procrastination: Frequency and Cognitive-Behavioural Correlates" (PDF).
- Gallagher, Robert P.; Golin, Anne; Kelleher, Kathleen (1992). "The Personal, Career, and Learning Skills Needs of College Students". Journal of College Student Development. 33 (4): 301–10.
- Norman A. Milgram; Barry Sroloff; Michael Rosenbaum (June 1988). "The Procrastination of Everyday Life". Journal of Research in Personality. 22 (2): 197–212. doi:10.1016/0092-6566(88)90015-3.
- Schraw, Gregory; Wadkins, Theresa; Olafson, Lori (2007). "Doing the Things We Do: A Grounded Theory of Academic Procrastination". Journal of Educational Psychology. 99: 12–25. doi:10.1037/0022-0618.104.22.168.
- Steel, Piers (2007). "The Nature of Procrastination: A Meta-Analytic and Theoretical Review of Quintessential Self-Regulatory Failure" (PDF). Psychological Bulletin. 133 (1): 65–94. doi:10.1037/0033-2909.133.1.65. PMID 17201571.
- Pychyl, T. (20 February 2012). "Due Tomorrow. Do Tomorrow". Psychology Today. Retrieved 20 February 2012.
- Fiore, Neil A (2006). The Now Habit: A Strategic Program for Overcoming Procrastination and Enjoying Guilt- Free Play. New York: Penguin Group. p. 5. ISBN 978-1-58542-552-5.
- Steel, Piers (2010). The Procrastination Equation: How to Stop Putting Things Off and Start Getting Stuff Done. New York: HarperCollins. ISBN 978-0-06-170361-4.[page needed]
- McGarvey. Jason A. (1996). "The Almost Perfect Definition".
- LeBon, Tim. Wise Therapy. Sage Publications LTD. p. 85.
- Gendler, Tamar Szabó (2007). "Self-Deception As Pretense". Philosophical Perspectives. 21: 231–258. doi:10.1111/j.1520-8583.2007.00127.x.
- Gosling, J. (1990). Weakness of the Will. New York: Routledge.[page needed]
- Lee, Dong-gwi; Kelly, Kevin R.; Edwards, Jodie K. (2006). "A Closer Look at the Relationships Among Trait Procrastination, Neuroticism, and Conscientiousness". Personality and Individual Differences. 40: 27–37. doi:10.1016/j.paid.2005.05.010.
- Sabini, J. & Silver, M. (1982) Moralities of everyday life, p.128
- Steel, P.; Brothen, T.; Wambach, C. (2001). "Procrastination and Personality, Performance and Mood". Personality and Individual Differences. 30: 95–106. doi:10.1016/S0191-8869(00)00013-1.
- Pavlina, Steve. "How to Fall in Love with Procrastination". Retrieved 18 April 2013.
- Tice, D. M.; Baumeister, R. F. (1997). "Longitudinal Study of Procrastination, Performance, Stress, and Health: The Costs and Benefits of Dawdling". Psychological Science. 8: 454–458. doi:10.1111/j.1467-9280.1997.tb00460.x. JSTOR 40063233.
- Evans, James R. (8 August 2007). Handbook of Neurofeedback: Dynamics and Clinical Applications. Psychology Press. p. 293. ISBN 978-0-7890-3360-4. Retrieved 8 October 2010.
- Strub, RL (1989). "Frontal Lobe Syndrome in a Patient with Bilateral Globus Pallidus Lesions". Archives of Neurology. 46 (9): 1024–7. doi:10.1001/archneur.1989.00520450096027. PMID 2775008.
- Gustavson, Daniel E.; Miyake A; Hewitt JK; Friedman NP (4 April 2014). "Genetic Relations Among Procrastination, Impulsivity, and Goal-Management Ability Implications for the Evolutionary Origin of Procrastination". Psychological Science. e publication (6): 1178–1188. doi:10.1177/0956797614526260. PMID 24705635.
- Ellis and Knaus, 1977
- Hillary Rettig (2011), The 7 Secrets of the Prolific: The Definitive Guide to Overcoming Procrastination, Perfectionism, and Writer's Block
- James Prochaska, 1995
- Burka & Yuen (1990), Procrastination: Why You Do It, What To Do About It
- The Procrastination Equation, 2012
- Time management for unmanageable people, 1983
- Pychyl, T. A.; Lee, J. M.; Thibodeau, R.; Blunt, A. (2000). "Five Days of Emotion: An Experience Sampling Study of Undergraduate Student Procrastination (special issue)". Journal of Social Behavior and Personality. 15: 239–254.
- Schouwenburg, H.C. (1993). "Trait procrastination, time management, and academic behavior". Trait procrastination, time management, and academic behavior. 8: 647–662.
- Hsin Chun Chu, Angela; Nam Choi, Jin. "Rethinking Procrastination: Positive Effects of "Active" Procrastination Behavior on Attitudes and Performance". The Journal of Social Psychology. 145 (3): 245–264.
- Duffy, J. F.; Czeisler, C. A. (2002). "Age-Related Change in the Relationship Between Circadian Period, Circadian Phase, and Diurnal Preference in Humans".
- Steel, Piers (2007). "The Nature of Procrastination: A Meta-Analytic and Theoretical Review of Quintessential Self-Regulatory Failure" (PDF). Psychological Bulletin. 133 (1): 65–94. doi:10.1037/0033-2909.133.1.65. PMID 17201571.
- Jackson, T.; Fritch, A.; Nagasaka, T.; Pope, L. (2003). "Procrastination and Perceptions of Past, Present, and Future". Individual Differences Research. 1: 17–28.
- Odaci, Hatice (August 1, 2011). "Academic Self-Efficacy and Academic Procrastination as Predictors of Problematic Internet Use in University Students".
- Ariely, Dan; Wertenbroch, Klaus (2002). "Procrastination, Deadlines, and Performance: Self-Control by Precommitment" (PDF). Psychological Science. 13 (3): 219–224. doi:10.1111/1467-9280.00441. PMID 12009041.
- "Procrastination — The Writing Center at UNC-Chapel Hill". Writingcenter.unc.edu. Retrieved 2012-03-10.
- Tuckman, B. W., (1991) The Development and Concurrent Validity of the Procrastination Scale 
- Howell, A. J.; Watson, D. C.; Powell, R. A.; Buro, K. (2006). "Academic Procrastination: The Pattern and Correlates of Behavioral Postponement". Personality and Individual Differences. 40: 1519–1530. doi:10.1016/j.paid.2005.11.023.
- "Getting Around to Procrastination". Retrieved 10 October 2014.
- Patrzek, J.; Sattler, S.; van Veen, F.; Grunschel, C.; Fries, S. (2014). "Investigating the Effect of Academic Procrastination on the Frequency and Variety of Academic Misconduct: A Panel Study". Studies in Higher Education: 1–16. doi:10.1080/03075079.2013.854765.
- Steel, Piers (2010). The Procrastination Equation: How to Stop Putting Things Off and Start Getting Stuff Done. New York: HarperCollins. ISBN 978-0061703621
- Johnson, Juliet McEwen, The 9 Reasons People Procrastinate with Social Media
- Jane B. Burka; Lenora M. Yuen (2008). Procrastination: Why You Do It, What to Do About It Now. Da Capo Lifelong Books. p. 336. ISBN 978-0738211701.
- We're Sorry This Is Late ... We Really Meant To Post It Sooner: Research Into Procrastination Shows Surprising Findings; Gregory Harris; ScienceDaily.com; Jan. 10, 2007 (their source)
- Why We Procrastinate And How To Stop; ScienceDaily.com; Jan. 12, 2009
- Perry, John (2012). The Art of Procrastination: A Guide to Effective Dawdling, Lollygagging and Postponing. New York: Workman. ISBN 978-0761171676
- (Lay & Schouwenburg, 1993)
- "Integrating Theories of Motivation" (PDF). Academy of Management Review. 31 (4): 889–913. 2006. doi:10.5465/amr.2006.22527462.
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- Schouwenburg, H.C (1993). "Trait procrastination, time management, and academic behavior". https://www-scopus-com.jproxy.nuim.ie/record/display.uri?eid=2-s2.0-21344492853&origin=inward&txGid=8922AD549640D5B2BACA406E901F44B5.wsnAw8kcdt7IPYLO0V48gA%3a1. 8: 647–662. External link in