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Title: Groupthink  
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Subject: Conformity, Argument from authority, Herd behavior, Collectivism, Groupshift
Collection: Cognitive Biases, Conformity, Consensus, Error, Group Processes
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Groupthink is a psychological phenomenon that occurs within a group of people, in which the desire for harmony or conformity in the group results in an irrational or dysfunctional decision-making outcome. Group members try to minimize conflict and reach a consensus decision without critical evaluation of alternative viewpoints, by actively suppressing dissenting viewpoints, and by isolating themselves from outside influences.

Loyalty to the group requires individuals to avoid raising controversial issues or alternative solutions, and there is loss of individual creativity, uniqueness and independent thinking. The dysfunctional group dynamics of the "ingroup" produces an "illusion of invulnerability" (an inflated certainty that the right decision has been made). Thus the "ingroup" significantly overrates its own abilities in decision-making, and significantly underrates the abilities of its opponents (the "outgroup"). Furthermore groupthink can produce dehumanizing actions against the "outgroup".

Antecedent factors such as group cohesiveness, faulty group structure, and situational context (e.g., community panic) play into the likelihood of whether or not groupthink will impact the decision-making process.

Groupthink is a construct of social psychology but has an extensive reach, and influences literature in the fields of

External links

  • Baron, R. S. (2005). "So right it's wrong: groupthink and the ubiquitous nature of polarized group decision making". Advances in Experimental Social Psychology 37: 219–253.  
  • Ferraris, C.; Carveth, R. (2003). "NASA and the Columbia disaster: decision-making by groupthink?". Proceedings of the 2003 Association for Business Communication Annual Convention. 
  • Esser, J. K. (1998). "Alive and well after 25 years: a review of groupthink research". Organizational Behavior and Human Decision Processes 73 (2–3): 116–141.  
  • Hogg, M. A.; Hains, S. C. (1998). "Friendship and group identification: a new look at the role of cohesiveness in groupthink". European Journal of Social Psychology 28 (3): 323–341.  
  • Klein, D. B.; Stern, C. (Spring 2009). "Groupthink in academia: majoritarian departmental politics and the professional pyramid". The Independent Review: A Journal of Political Economy (Independent Institute) 13 (4): 585–600. 
  • Kowert, P. (2002). Groupthink or Deadlock: When do Leaders Learn from their Advisors?. Albany: State University of New York Press.  
  • Mullen, B.; Anthony, T.; Salas, E.; Driskell, J. E. (1994). "Group cohesiveness and quality of decision making: an integration of tests of the groupthink hypothesis". Small Group Research 25 (2): 189–204.  
  • Moorhead, G.; Ference, R.; Neck, C. P. (1991). "Group decision fiascoes continue: Space Shuttle Challenger and a revised groupthink framework". Human Relations 44 (6): 539–550.  
  • O'Connor, M. A. (Summer 2003). "The Enron board: the perils of groupthink". University of Cincinnati Law Review 71 (4): 1233–1320. 
  • Packer, D. J. (2009). "Avoiding groupthink: whereas weakly identified members remain silent, strongly identified members dissent about collective problems". Psychological Science 20 (5): 546–548.  
  • Rose, J. D. (Spring 2011). "Diverse perspectives on the groupthink theory – a literary review". Emerging Leadership Journeys 4 (1): 37–57. 
  • Schafer, M.; Crichlow, S. (2010). Groupthink versus High-Quality Decision Making in International Relations. New York: Columbia University Press.  
  • 't Hart, P. (1990). Groupthink in Government: a Study of Small Groups and Policy Failure. Amsterdam; Rockland, MA: Swets & Zeitlinger.  
  • 't Hart, P.; Stern, E. K.; Sundelius, B. (1997). Beyond Groupthink: Political Group Dynamics and Foreign Policy-Making. Ann Arbor: University of Michigan Press.  
  • Tetlock, P. E. (1979). "Identifying victims of groupthink from public statements of decision makers". Journal of Personality and Social Psychology 37 (8): 1314–1324.  
  • Tetlock, P. E.; Peterson, R. S.; McGuire, C.; Chang, S. J.; Feld, P. (1992). "Assessing political group dynamics: a test of the groupthink model". Journal of Personality and Social Psychology 63 (3): 403–425.  
  • Turner, M. E.; Pratkanis, A. R.; Probasco, P.; Leve, C. (1992). "Threat, cohesion, and group effectiveness: Testing a social identity maintenance perspective on groupthink". Journal of Personality and Social Psychology 63 (5): 781–796.  
  • Whyte, G. (1989). "Groupthink reconsidered". Academy of Management Review 14 (1): 40–56.  

Further reading

  1. ^ a b c Turner, M. E.; Pratkanis, A. R. (1998). "Twenty-five years of groupthink theory and research: lessons from the evaluation of a theory". Organizational Behavior and Human Decision Processes 73: 105–115.  
  2. ^ Wexler, Mark N. et al. (1995). "Expanding the groupthink explanation to the study of contemporary cults". Cultic Studies Journal 12 (1): 49–71. 
  3. ^ a b Turner, M.; Pratkanis, A. (1998). "A social identity maintenance model of groupthink". Organizational Behavior and Human Decision Processes 73: 210–235.  
  4. ^ Sherman, Mark (2011, March 10). Does liberal truly mean open-minded? Psychology Today.
  5. ^ *Cain, Susan (January 13, 2012). "The rise of the new groupthink". New York Times. .
  6. ^ a b c d e f g h i Janis, I. L. (November 1971). "Groupthink". Psychology Today 5 (6): 43–46, 74–76. 
  7. ^ a b c d Janis, I. L. (1972). Victims of Groupthink: a Psychological Study of Foreign-Policy Decisions and Fiascoes. Boston: Houghton Mifflin.  
  8. ^ a b c d e Janis, I. L. (1982). Groupthink: Psychological Studies of Policy Decisions and Fiascoes. Boston: Houghton Mifflin.  
  9. ^ 't Hart, P. (1998). "Preventing groupthink revisited: evaluating and reforming groups in government". Organizational Behavior and Human Decision Processes 73: 306–326.  
  10. ^ a b McCauley, C. (1989). "The nature of social influence in groupthink: compliance and internalization". Journal of Personality and Social Psychology 57: 250–260.  
  11. ^  
  12. ^  
  13. ^ Cross, Mary (2011). Bloggerati, Twitterati: How Blogs and Twitter are Transforming Popular Culture.  
  14. ^  
  15. ^ Jonathan I., Klein (2000). Corporate Failure by Design: Why Organizations are Built to Fail.  
  16. ^ a b Hart, Paul't (1991). "Irving L. Janis' Victims of Groupthink". Political Psychology 2: 247–278.  
  17. ^ a b c d Aldag, R. J.; Fuller, S. R. (1993). "Beyond fiasco: A reappraisal of the groupthink phenomenon and a new model of group decision processes". Psychological Bulletin 113 (3): 533–552.  
  18. ^ a b Flowers, M.L. (1977). "A laboratory test of some implications of Janis's groupthink hypothesis". Journal of Personality and Social Psychology 35 (12): 888–896.  
  19. ^ Schafer, M.; Crichlow, S. (1996). "Antecedents of groupthink: a quantitative study". Journal of Conflict Resolution 40 (3): 415–435.  
  20. ^ Cline, R. J. W. (1990). "Detecting groupthink: methods for observing the illusion of unanimity". Communication Quarterly 38 (2): 112–126.  
  21. ^ a b c d e f g h i Park, W.-W. (1990). "A review of research on Groupthink". Journal of Behavioral Decision Making 3 (4): 229–245.  
  22. ^ Manz, C.C. & Sims, H.P . 1982. The potential for "groupthink" in autonomous work groups. Human Relations, 35(9) 773-784
  23. ^ Fodor, Eugene M.; Smith, Terry, Jan 1982, The power motive as an influence on group decision making, Journal of Personality and Social Psychology, Vol 42(1), 178-185. doi: 10.1037/0022-3514.42.1.178
  24. ^ Callaway, Michael R.; Marriott, Richard G.; Esser, James K., Oct 1985, Effects of dominance on group decision making: Toward a stress-reduction explanation of groupthink, Journal of Personality and Social Psychology, Vol 49(4), 949-952. doi: 10.1037/0022-3514.49.4.949
  25. ^ Carrie, R. Leana (1985). A partial test of Janis' Groupthink Model: Effects of group cohesiveness and leader behavior on defective decision making, "Journal of Management", vol. 11(1), 5-18. doi: 10.1177/014920638501100102
  26. ^ Raven, B. H. (1998). "Groupthink: Bay of Pigs and Watergate reconsidered". Organizational Behavior and Human Decision Processes 73 (2/3): 352–361.  
  27. ^ a b Badie, D. (2010). "Groupthink, Iraq, and the War on Terror: explaining US policy shift toward Iraq". Foreign Policy Analysis 6 (4): 277–296.  
  28. ^ a b c d Hermann, A.; Rammal, H. G. (2010). "The grounding of the "flying bank"". Management Decision 48 (7): 1051.  
  29. ^ Eaton, Jack (2001). Management communication: The threat of groupthink. Corporate Communication, 6, 183–192.
  30. ^ a b Koerber, C. P.; Neck, C. P. (2003). "Groupthink and sports: an application of Whyte's model". International Journal of Contemporary Hospitality Management 15: 20–28.  
  31. ^ Baron, R. (2005). "So right it's wrong: Groupthink and the ubiquitous nature of polarized group decision making". Advances in Experimental Social Psychology 37: 35.  
  32. ^ a b c Kramer, R. M. (1998). "Revisiting the Bay of Pigs and Vietnam decisions 25 years later: How well has the groupthink hypothesis stood the test of time?.". Organizational Behavior & Human Decision Processes 73 (2/3): 238.  
  33. ^ Whyte, G. (1998). "Recasting Janis's Groupthink model: The key role of collective efficacy in decision fiascoes". Organization Behavior and Human Decision Processes 73 (2/3): 185–209.  
  34. ^ McCauley, C. (1998). "Group dynamics in Janis's theory of groupthink: Backward and forward". Organizational Behavior and Human Decision Processes 73 (2/3): 142–162.  
  35. ^ Tsoukalas, I. (2007). "Exploring the microfoundations of group consciousness". Culture and Psychology 13 (1): 39–81.  


See also

According to a new theory many of the basic characteristics of groupthink - e.g., strong cohesion, indulgent atmosphere, and exclusive ethos - are the result of a special kind of mnemonic encoding (Tsoukalas, 2007). Members of tightly knit groups have a tendency to represent significant aspects of their community as episodic memories and this has a predictable influence on their group behavior and collective ideology.[35]

Sociocognitive theory

Whyte (1998) suggests that collective efficacy plays a large role in groupthink because it causes groups to become less vigilant and to favor risks, two particular factors that characterize groups affected by groupthink.[33] McCauley recasts aspects of groupthink's preconditions by arguing that the level of attractiveness of group members is the most prominent factor in causing poor decision-making.[34] The results of Turner's and Pratkanis' (1991) study on social identity maintenance perspective and groupthink conclude that groupthink can be viewed as a "collective effort directed at warding off potentially negative views of the group."[3] Together, the contributions of these scholars have brought about new understandings of groupthink that help reformulate Janis' original model.


Other scholars attempt to assess the merit of groupthink by reexamining case studies that Janis had originally used to buttress his model. Roderick Kramer (1998) believed that, because scholars today have a more sophisticated set of ideas about the general decision-making process and because new and relevant information about the fiascos have surfaced over the years, a reexamination of the case studies is appropriate and necessary.[32] He argues that new evidence does not support Janis' view that groupthink was largely responsible for President Kennedy's and President Johnson's decisions in the Bay of Pigs Invasion and U.S. escalated military involvement in the Vietnam War, respectively. Both presidents sought the advice of experts outside of their political groups more than Janis suggested.[32]:241 Kramer also argues that the presidents were the final decision-makers of the fiascos; while determining which course of action to take, they relied more heavily on their own construals of the situations than on any group-consenting decision presented to them.[32]:241 Kramer concludes that Janis' explanation of the two military issues is flawed and that groupthink has much less influence on group decision-making than is popularly believed to be.


Aldag and Fuller (1993) argue that the groupthink concept was based on a "small and relatively restricted sample" that became too broadly generalized.[17] Furthermore, the concept is too rigidly staged and deterministic. Empirical support for it has also not been consistent. The authors compare groupthink model to findings presented by Maslow and Piaget; they argue that, in each case, the model incites great interest and further research that, subsequently, invalidate the original concept. Aldag and Fuller thus suggest a new model called the general group problem-solving (GGPS) model, which integrates new findings from groupthink literature and alters aspects of groupthink itself.[17]:534 The primary difference between the GGPS model and groupthink is that the former is more value neutral and more political.[17]:544

General group problem-solving (GGPS) model

Researcher Robert Baron (2005) contends that the connection between certain antecedents Janis believed necessary have not been demonstrated by the current collective body of research on groupthink. He believes that Janis' antecedents for groupthink is incorrect and argues that not only are they "not necessary to provoke the symptoms of groupthink, but that they often will not even amplify such symptoms."[31] As an alternative to Janis' model, Baron proposes a ubiquity model of groupthink. This model provides a revised set of antecedents for groupthink, including social identification, salient norms, and low self-efficacy.

Ubiquity model

Recent developments

Recent literature of groupthink attempts to study the application of this concept beyond the framework of business and politics. One particularly relevant and popular arena in which groupthink is rarely studied is sports. The lack of literature in this area prompted Charles Koerber and Christopher Neck to begin a case-study investigation that examined the effect of groupthink on the decision of the Major League Umpires Association (MLUA) to stage a mass resignation in 1999. The decision was a failed attempt to gain a stronger negotiating stance against Major League Baseball.[30]:21 Koerber and Neck suggest that three groupthink symptoms can be found in the decision-making process of the MLUA. First, the umpires overestimated the power that they had over the baseball league and the strength of their group's resolve. The union also exhibited some degree of closed-mindedness with the notion that MLB is the enemy. Lastly, there was the presence of self-censorship; some umpires who disagreed with the decision to resign failed to voice their dissent.[30]:25 These factors, along with other decision-making defects, led to a decision that was suboptimal and ineffective.


Another example of groupthink from the corporate world is illustrated in the UK based companies, Marks & Spencer and British Airways. The negative impact of groupthink took place during the 1990s as both companies released globalization expansion strategies. Researcher Jack Eaton's content analysis of media press releases revealed that all eight symptoms of groupthink were present during this period. The most predominant symptom of groupthink was the illusion of invulnerability as both companies underestimated potential failure due to years of profitability and success during challenging markets. Up until the consequence of groupthink erupted they were considered blue chips and darlings of the London Stock Exchange. During 1998 - 1999 the price of Marks & Spencer shares fell from 590 to less than 300 and that of British Airways from 740 to 300. Both companies had already featured prominently in the UK press and media for more positive reasons, to do with national pride in their undoubted sector-wide performance.[29]

Marks & Spencer and British Airways

Aaron Hermann and Hussain Rammal illustrate the detrimental role of groupthink in the collapse of Swissair, a Swiss airline company that was thought to be so financially stable that it earned the title the "Flying Bank."[28] The authors argue that, among other factors, Swissair carried two symptoms of groupthink: the belief that the group is invulnerable and the belief in the morality of the group.[28]:1056 In addition, before the fiasco, the size of the company board was reduced, subsequently eliminating industrial expertise. This may have further increased the likelihood of groupthink.[28]:1055 With the board members lacking expertise in the field and having somewhat similar background, norms, and values, the pressure to conform may have become more prominent.[28]:1057 This phenomenon is called group homogeneity, which is an antecedent to groupthink. Together, these conditions may have contributed to the poor decision-making process that eventually led to Swissair's collapse.


In the corporate world, ineffective and suboptimal group decision-making can negatively affect the health of a company and cause a considerable amount of monetary loss.

Corporate world

  • "The Japanese would never dare attempt a full-scale surprise assault against Hawaii because they would realize that it would precipitate an all-out war, which the United States would surely win."
  • "The Pacific Fleet concentrated at Pearl Harbor was a major deterrent against air or naval attack."
  • "Even if the Japanese were foolhardy to send their carriers to attack us [the United States], we could certainly detect and destroy them in plenty of time."
  • "No warships anchored in the shallow water of Pearl Harbor could ever be sunk by torpedo bombs launched from enemy aircraft."

The Navy and Army in Pearl Harbor also shared rationalizations about why an attack was unlikely. Some of them included:[8]:83,85

The attack on Pearl Harbor on December 7, 1941 is a prime example of groupthink. A number of factors such as shared illusions and rationalizations contributed to the lack of precaution taken by Naval officers based in Hawaii. The United States had intercepted Japanese messages and they discovered that Japan was arming itself for an offensive attack somewhere in the Pacific. Washington took action by warning officers stationed at Pearl Harbor, but their warning was not taken seriously. They assumed that Japan was taking measures in the event that their embassies and consulates in enemy territories were usurped.

Pearl Harbor

Janis claimed the fiasco that ensued could have been prevented if the Kennedy administration had followed the methods to preventing groupthink adopted during the Cuban Missile Crisis, which took place just one year later in October 1962. In the latter crisis, essentially the same political leaders were involved in decision-making, but this time they learned from their previous mistake of seriously under-rating their opponents.[6]:76

The United States Bay of Pigs Invasion of April 1961 was the primary case study that Janis used to formulate his theory of groupthink.[6] The invasion plan was initiated by the Eisenhower administration, but when the Kennedy White House took over, it "uncritically accepted" the CIA's plan.[6]:44 When some people, such as Arthur M. Schlesinger, Jr. and Senator J. William Fulbright, attempted to present their objections to the plan, the Kennedy team as a whole ignored these objections and kept believing in the morality of their plan.[6]:46 Eventually Schlesinger minimized his own doubts, performing self-censorship.[6]:74 The Kennedy team stereotyped Castro and the Cubans by failing to question the CIA about its many false assumptions, including the ineffectiveness of Castro's air force, the weakness of Castro's army, and the inability of Castro to quell internal uprisings.[6]:46

Bay of Pigs invasion and the Cuban Missile Crisis

Groupthink can have a strong hold on political decisions and military operations, which may result in enormous wastage of human and material resources. Highly qualified and experienced politicians and military commanders sometimes make very poor decisions when in a suboptimal group setting. Scholars such as Janis and Raven attribute political and military fiascoes, such as the Bay of Pigs Invasion, Vietnam War, and the Watergate scandal, to the effect of groupthink.[8][26] More recently, Dina Badie argued that groupthink was largely responsible for the shift in the U.S. administration's view on Saddam Hussein that eventually led to the 2003 invasion of Iraq by the United States.[27] After 9/11, "stress, promotional leadership, and intergroup conflict" were all factors that gave rise to the occurrence of groupthink.[27]:283 Political case studies of groupthink serve to illustrate the impact that the occurrence of groupthink can have in today's political scene.

Politics and military

Case studies

Overall, studies on groupthink have largely focused on the factors (antecedents) that predict groupthink. Groupthink occurrence is often measured by number of ideas/solutions generated within a group, but there is no uniform, concrete standard by which researchers can objectively conclude groupthink occurs.[18] The studies of groupthink and groupthink antecedents reveal a mixed body of results. Some studies indicate group cohesion and leadership style to be powerfully predictive of groupthink, while other studies indicate the insignificance of these factors. Group homogeneity and group insulation are generally supported as factors predictive of groupthink.

Park (1990) found that "only 16 empirical studies have been published on groupthink," and concluded that they "resulted in only partial support of his [Janis's] hypotheses."[21]:230 Park concludes, "despite Janis' claim that group cohesiveness is the major necessary antecedent factor, no research has showed a significant main effect of cohesiveness on groupthink."[21]:230 Park also concludes that research on the interaction between group cohesiveness and leadership style does not support Janis' claim that cohesion and leadership style interact to produce groupthink symptoms.[21] Park presents a summary of the results of the studies analyzed. According to Park, a study by Huseman and Drive (1979) indicates groupthink occurs in both small and large decision making groups within businesses.[21] This results partly from group isolation within the business. Manz and Sims (1982) conducted a study showing that autonomous work groups are susceptible to groupthink symptoms in the same manner as decisions making groups within businesses.[21][22] Fodor and Smith (1982) produced a study revealing that group leaders with high power motivation create atmospheres more susceptible to groupthink.[21][23] Leaders with high power motivation possess characteristics similar to leaders with a "closed" leadership style—an unwillingness to respect dissenting opinion. The same study indicates that level of group cohesiveness is insignificant in predicting groupthink occurrence. Park summarizes a study performed by Callaway, Marriot, and Esser (1985) in which groups with highly dominant members "made higher quality decisions, exhibited lowered state of anxiety, took more time to reach a decision, and made more statements of disagreement/agreement."[21]:232[24] Overall, groups with highly dominant members expressed characteristics inhibitory to groupthink. If highly dominant members are considered equivalent to leaders with high power motivation, the results of Callaway, Marriot, and Esser contradict the results of Fodor and Smith. A study by Leana (1985) indicates the interaction between level of group cohesion and leadership style is completely insignificant in predicting groupthink.[21][25] This finding refutes Janis' claim that the factors of cohesion and leadership style interact to produce groupthink. Park summarizes a study by McCauley (1989) in which structural conditions of the group were found to predict groupthink while situational conditions did not.[10][21] The structural conditions included group insulation, group homogeneity, and promotional leadership. The situational conditions included group cohesion. These findings refute Janis' claim about group cohesiveness predicting groupthink.

It has been incredibly difficult to test groupthink in the laboratory because it removes groups from real social situations, which changes the variables conducive or inhibitive to groupthink.[18] Because of its subjectivity, researchers have struggled to measure groupthink as a complete phenomenon. Instead, they often opt to measure particular factors of the groupthink phenomenon. These factors range from causal to effectual and focus on group and situational aspects.[19][20]

Empirical findings and meta-analysis

By following these guidelines, groupthink can be avoided. After the Bay of Pigs invasion fiasco, President John F. Kennedy sought to avoid groupthink during the Cuban Missile Crisis using "vigilant appraisal."[8]:148–153 During meetings, he invited outside experts to share their viewpoints, and allowed group members to question them carefully. He also encouraged group members to discuss possible solutions with trusted members within their separate departments, and he even divided the group up into various sub-groups, to partially break the group cohesion. Kennedy was deliberately absent from the meetings, so as to avoid pressing his own opinion.

  1. Leaders should assign each member the role of "critical evaluator". This allows each member to freely air objections and doubts.
  2. Leaders should not express an opinion when assigning a task to a group.
  3. Leaders should absent themselves from many of the group meetings to avoid excessively influencing the outcome.
  4. The organization should set up several independent groups, working on the same problem.
  5. All effective alternatives should be examined.
  6. Each member should discuss the group's ideas with trusted people outside of the group.
  7. The group should invite outside experts into meetings. Group members should be allowed to discuss with and question the outside experts.
  8. At least one group member should be assigned the role of Devil's advocate. This should be a different person for each meeting.

According to Janis, decision making groups are not necessarily destined to groupthink. He devised ways of preventing groupthink:[7]:209–215

It has been thought that groups with the strong ability to work together will be able to solve dilemmas in a quicker and more efficient fashion than an individual. Groups have a greater amount of resources which lead them to be able to store and retrieve information more readily and come up with more alternative solutions to a problem. There was a recognized downside to group problem solving in that it takes groups more time to come to a decision and requires that people make compromises with each other. However, it was not until the research of Janis appeared that anyone really considered that a highly cohesive group could impair the group's ability to generate quality decisions. Tightly-knit groups may appear to make decisions better because they can come to a consensus quickly and at a low energy cost; however, over time this process of decision making may decrease the members' ability to think critically. It is, therefore, considered by many to be important to combat the effects of groupthink.[16]

  1. The purpose of group problem solving is mainly to improve decision quality
  2. Group problem solving is considered a rational process.
  3. Benefits of group problem solving:
    • variety of perspectives
    • more information about possible alternatives
    • better decision reliability
    • dampening of biases
    • social presence effects
  4. Groupthink prevents these benefits due to structural faults and provocative situational context
  5. Groupthink prevention methods will produce better decisions
  6. An illusion of well-being is presumed to be inherently dysfunctional.
  7. Group pressures towards consensus lead to concurrence-seeking tendencies.

As observed by Aldag & Fuller (1993), the groupthink phenomenon seems to rest on a set of unstated and generally restrictive assumptions:[17]


Although it is possible for a situation to contain all three of these factors, all three are not always present even when groupthink is occurring. Janis considered a high degree of cohesiveness to be the most important antecedent to producing groupthink and always present when groupthink was occurring; however, he believed high cohesiveness would not always produce groupthink. A very cohesive group abides to all group norms; whether or not groupthink arises is dependent on what the group norms are. If the group encourages individual dissent and alternative strategies to problem solving, it is likely that groupthink will be avoided even in a highly cohesive group. This means that high cohesion will lead to groupthink only if one or both of the other antecedents is present, situational context being slightly more likely than structural faults to produce groupthink.[16]

  1. High group cohesiveness
    • deindividuation: group cohesiveness becomes more important than individual freedom of expression
  2. Structural faults:
    • insulation of the group
    • lack of impartial leadership
    • lack of norms requiring methodological procedures
    • homogeneity of members' social backgrounds and ideology
  3. Situational context:
    • highly stressful external threats
    • recent failures
    • excessive difficulties on the decision-making task
    • moral dilemmas

Janis prescribed three antecedent conditions to groupthink.[7]:9


  1. Self-censorship of ideas that deviate from the apparent group consensus.
  2. Illusions of unanimity among group members, silence is viewed as agreement.
  3. Direct pressure to conform placed on any member who questions the group, couched in terms of "disloyalty"
  4. Mindguards— self-appointed members who shield the group from dissenting information.

Type III: Pressures toward uniformity

  1. Rationalizing warnings that might challenge the group's assumptions.
  2. Stereotyping those who are opposed to the group as weak, evil, biased, spiteful, impotent, or stupid.

Type II: Closed-mindedness

  1. Illusions of invulnerability creating excessive optimism and encouraging risk taking.
  2. Unquestioned belief in the morality of the group, causing members to ignore the consequences of their actions.

Type I: Overestimations of the group — its power and morality

To make groupthink testable, Irving Janis devised eight symptoms indicative of groupthink.


  • "Groupthink by Compulsion [...] [G]roupthink at least implies voluntarism. When this fails, the organization is not above outright intimidation. [...] In [a nationwide telecommunications company], refusal by the new hires to cheer on command incurred consequences not unlike the indoctrination and brainwashing techniques associated with a Soviet-era gulag."[15]
  • "[...] leaders often have beliefs which are very far from matching reality and which can become more extreme as they are encouraged by their followers. The predilection of many cult leaders for abstract, ambiguous, and therefore unchallengeable ideas can further reduce the likelihood of reality testing, while the intense milieu control exerted by cults over their members means that most of the reality available for testing is supplied by the group environment. This is seen in the phenomenon of 'groupthink', alleged to have occurred, notoriously, during the Bay of Pigs fiasco."[14]
  • " [...] critics of Twitter point to the predominance of the hive mind in such social media, the kind of groupthink that submerges independent thinking in favor of conformity to the group, the collective"[13]

Nevertheless, outside research psychology and sociology, wider culture has come to detect groupthink (somewhat fuzzily defined) in observable situations, for example:

After the publication of Janis' book Victims of Groupthink in 1972,[7] and a revised edition with the title Groupthink: Psychological Studies of Policy Decisions and Fiascoes in 1982,[8] the concept of groupthink was used to explain many other faulty decisions in history. These events included social psychology, management, strategy, counseling, and marketing. One can most likely explain this lack of follow-up in that group research is difficult to conduct, groupthink has many independent and dependent variables, and it is unclear "how to translate [groupthink's] theoretical concepts into observable and quantitative constructs."[1]:107–108

Janis set the foundation for the study of groupthink starting with his research in the American Soldier Project where he studied the effect of extreme stress on group cohesiveness. After this study he remained interested in the ways in which people make decisions under external threats. This interest led Janis to study a number of "disasters" in American foreign policy, such as failure to anticipate the Japanese attack on Pearl Harbor (1941); the Bay of Pigs Invasion fiasco (1961); and the prosecution of the Vietnam War (1964–67) by President Lyndon Johnson. He concluded that in each of these cases, the decisions occurred largely because of groupthink, which prevented contradictory views from being expressed and subsequently evaluated.

The main principle of groupthink, which I offer in the spirit of Parkinson's Law, is this: The more amiability and esprit de corps there is among the members of a policy-making ingroup, the greater the danger that independent critical thinking will be replaced by groupthink, which is likely to result in irrational and dehumanizing actions directed against outgroups.[6]:44

He went on to write:

I use the term groupthink as a quick and easy way to refer to the mode of thinking that persons engage in when concurrence-seeking becomes so dominant in a cohesive ingroup that it tends to override realistic appraisal of alternative courses of action. Groupthink is a term of the same order as the words in the newspeak vocabulary George Orwell used in his dismaying world of 1984. In that context, groupthink takes on an invidious connotation. Exactly such a connotation is intended, since the term refers to a deterioration in mental efficiency, reality testing and moral judgments as a result of group pressures.[6]:43

George Orwell. He initially defined groupthink as follows:

Groupthink being a coinage - and, admittedly, a loaded one - a working definition is in order. We are not talking about mere instinctive conformity - it is, after all, a perennial failing of mankind. What we are talking about is a rationalized conformity - an open, articulate philosophy which holds that group values are not only expedient but right and good as well.[11][12]

William H. Whyte, Jr. coined the term in 1952 in Fortune magazine:

From "Groupthink" by William H. Whyte, Jr. in Fortune magazine, March 1952



  • History 1
  • Symptoms 2
  • Causes 3
  • Prevention 4
  • Empirical findings and meta-analysis 5
  • Case studies 6
    • Politics and military 6.1
      • Bay of Pigs invasion and the Cuban Missile Crisis 6.1.1
      • Pearl Harbor 6.1.2
    • Corporate world 6.2
      • Swissair 6.2.1
      • Marks & Spencer and British Airways 6.2.2
    • Sports 6.3
  • Recent developments 7
    • Ubiquity model 7.1
      • General group problem-solving (GGPS) model 7.1.1
    • Reexamination 7.2
    • Reformulation 7.3
    • Sociocognitive theory 7.4
  • See also 8
  • References 9
  • Further reading 10
  • External links 11

Most of the initial research on groupthink was conducted by Irving Janis, a research psychologist from Yale University.[6] Janis published an influential book in 1972, which was revised in 1982.[7][8] Later studies have evaluated and reformulated his groupthink model.[9][10]

Groupthink is sometimes stated to occur (more broadly) within natural groups within the community, for example to explain the lifelong different mindsets of conservatives versus liberals,[4] or the solitary nature of introverts.[5] However, this conformity of viewpoints within a group does not mainly involve deliberate group decision-making, and thus is perhaps better explained by the collective confirmation bias of the individual members of the group.

[3][2] behaviour.cult as well as important aspects of deviant religious [1]

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