What Is Conformity? Definition, Types, Psychology Research

Conformity is a type of social influence involving a change in belief or behavior in order to fit in with a group.

This change is in response to real (involving the physical presence of others) or imagined (involving the pressure of social norms/expectations) group pressure.

Conformity can also be simply defined as “ yielding to group pressures” (Crutchfield, 1955).  Group pressure may take different forms, for example bullying, persuasion, teasing, criticism, etc.  Conformity is also known as majority influence (or group pressure).

The term conformity is often used to indicate an agreement to the majority position, brought about either by a desire to ‘ fit in ’ or be liked (normative) or because of a desire to be correct (informational), or simply to conform to a social role (identification).

Jenness (1932) was the first psychologist to study conformity.  His experiment was an ambiguous situation involving a glass bottle filled with beans.

He asked participants individually to estimate how many beans the bottle contained.  Jenness then put the group in a room with the bottle and asked them to provide a group estimate through discussion.

Participants were then asked to estimate the number on their own again to find whether their initial estimates had altered based on the influence of the majority.

Jenness then interviewed the participants individually again and asked if they would like to change their original estimates or stay with the group’s estimate.  Almost all changed their individual guesses to be closer to the group estimate.

However, perhaps the most famous conformity experiment was by Solomon Asch (1951) and his line judgment experiment.

Types of Conformity

Kelman (1958) distinguished between three different types of conformity:

Compliance (or group acceptance)

This occurs “when an individual accepts influence because he hopes to achieve a favorable reaction from another person or group. He adopts the induced behavior because….he expects to gain specific rewards or approval and avoid specific punishment or disapproval by conformity” (Kelman, 1958, p. 53).

In other words, conforming to the majority (publicly) in spite of not really agreeing with them (privately). This is seen in Asch’s line experiment.

Compliance stops when there are no group pressures to conform and is, therefore, a temporary behavior change.

Internalization (genuine acceptance of group norms)

This occurs “when an individual accepts influence because the content of the induced behavior – the ideas and actions of which it is composed – is intrinsically rewarding. He adopts the induced behavior because it is congruent [consistent] with his value system” (Kelman, 1958, p. 53).

Internalization always involves public and private conformity. A person publicly changes their behavior to fit in with the group while also agreeing with them privately.

This is the deepest level of conformity, where the beliefs of the group become part of the individual’s own belief system. This means the change in behavior is permanent. This is seen in Sherif’s autokinetic experiment.

This is most likely to occur when the majority has greater knowledge and members of the minority have little knowledge to challenge the majority’s position.

Identification (or group membership)

This occurs “when an individual accepts influence because he wants to establish or maintain a satisfying self-defining relationship to another person or group” (Kelman, 1958, p. 53).

Individuals conform to the expectations of a social role, e.g., nurses and police officers.

It is similar to compliance as there does not have to be a change in private opinion. A good example is Zimbardo’s Prison Study.

Man (1969) identified an additional type of conformity:


This is when a person conforms to impress or gain favor/acceptance from other people.

It is similar to normative influence but is motivated by the need for social rewards rather than the threat of rejection, i.e., group pressure does not enter the decision to conform.

Why Do People Conform?

Deutsch and Gerrard (1955) identified two reasons why people conform:

Normative Conformity

  • Yielding to group pressure because a person wants to fit in with the group. E.g., Asch Line Study.
  • Conforming because the person is scared of being rejected by the group.
  • This type of conformity usually involves compliance – where a person publicly accepts the views of a group but privately rejects them.

Informational Conformity

  • This usually occurs when a person lacks knowledge and looks to the group for guidance.
  • Or when a person is in an ambiguous (i.e., unclear) situation and socially compares their behavior with the group. E.g., Sherif’s Study.
  • This type of conformity usually involves internalization – where a person accepts the views of the groups and adopts them as an individual.

Conformity Examples

Sherif (1935) Autokinetic Effect Experiment

Aim: Sherif (1935) conducted an experiment with the aim of demonstrating that people conform to group norms when they are put in an ambiguous (i.e., unclear) situation.

Method: Sherif used a lab experiment to study conformity.  He used the autokinetic effect – this is where a small spot of light (projected onto a screen) in a dark room will appear to move even though it is still (i.e., it is a visual illusion).

It was discovered that when participants were individually tested, their estimates of how far the light moved varied considerably (e.g., from 20cm to 80cm).

The participants were then tested in groups of three.  Sherif manipulated the composition of the group by putting together two people whose estimate of the light movement when alone was very similar and one person whose estimate was very different.  Each person in the group had to say aloud how far they thought the light had moved.

Results: Sherif found that over numerous estimates (trials) of the movement of light, the group converged to a common estimate.  The person whose estimate of movement was greatly different from the other two in the group conformed to the view of the other two.

Sherif said that this showed that people would always tend to conform.  Rather than make individual judgments, they tend to come to a group agreement.

Conclusion : The results show that when in an ambiguous situation (such as the autokinetic effect), a person will look to others (who know more / better) for guidance (i.e., adopt the group norm).  They want to do the right thing but may lack the appropriate information.  Observing others can provide this information.  This is known as informational conformity.

Non Conformity

Not everyone conforms to social pressure.  Indeed, there are many factors that contribute to an individual’s desire to remain independent of the group.

For example, Smith and Bond (1998) discovered cultural differences in conformity between western and eastern countries.  People from Western cultures (such as America and the UK) are more likely to be individualistic and don’t want to be seen as being the same as everyone else.

This means that they value being independent and self-sufficient (the individual is more important than the group) and, as such, are more likely to participate in non-conformity.

In contrast, eastern cultures (such as Asian countries) are more likely to value the needs of the family and other social groups before their own.  They are known as collectivist cultures and are more likely to conform.


Asch, S. E. (1951). Effects of group pressure upon the modification and distortion of judgments. In H. Guetzkow (Ed.), Groups, leadership and men. Pittsburg, PA: Carnegie Press.

Crutchfield, R. (1955). Conformity and Character. American Psychologist, 10, 191-198.

Deutsch, M., & Gerard, H. B. (1955). A study of normative and informational social influences upon individual judgment. The journal of abnormal and social psychology, 51(3), 629.

Jenness, A. (1932). The role of discussion in changing opinion regarding a matter of fact.  The Journal of Abnormal and Social Psychology, 27, 279-296.

Kelman, H. C. (1958). Compliance, identification, and internalization: three processes of attitude change. Journal of Conflict Resolution, 2, 51–60.

Mann, L (1969). Social Psychology. New York: Wiley.

Sherif, M. (1935). A study of some social factors in perception. Archives of Psychology, 27(187) .

Smith, P. B., & Bond, M. H. (1993). Social Psychology Across Cultures: Analysis and Perspectives. Hemel Hempstead: Harvester Wheatsheaf.

Olivia Guy-Evans

BSc (Hons), Psychology, MSc, Psychology of Education

Associate Editor for Simply Psychology

Olivia Guy-Evans is a writer and associate editor for Simply Psychology. She has previously worked in healthcare and educational sectors.

Saul Mcleod, PhD

Educator, Researcher

BSc (Hons) Psychology, MRes, PhD, University of Manchester

Saul Mcleod, Ph.D., is a qualified psychology teacher with over 18 years experience of working in further and higher education.