Group influence: WACE Year 12 Psychology Unit 4
“Explain group processes including social loafing, deindividuation, group polarisation and groupthink, and their effects on individual behaviour”
Being in a group changes behaviour: social facilitation improves easy tasks when watched, social loafing reduces individual effort in groups, deindividuation loosens self-restraint when people feel anonymous, group polarisation makes group decisions more extreme than individual ones, and groupthink leads cohesive groups to make poor decisions by suppressing dissent.
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Group processes such as social loafing, deindividuation and groupthink are not part of the SCSA Psychology ATAR Year 12 syllabus (Units 3 and 4, taught since 2024), so this page is not examined in the WACE Psychology ATAR exam. Social influence, including deindividuation and groupthink, is now in the Year 11 syllabus (Unit 2: Attitudes, stereotypes and social influence). The nearest Year 12 content is observational learning.
What this dot point is asking
SCSA asks you to define each group process, explain why it occurs, and apply it to examples. The marked skill is distinguishing these closely related effects and naming the right one for a scenario.
Social facilitation and social loafing
The presence of others changes how hard and how well we perform.
- Social facilitation is the tendency to perform better on simple or well-learned tasks when others are present or watching, because arousal boosts the dominant response. On difficult or new tasks the same arousal can impair performance.
- Social loafing is the tendency to put in less individual effort when working in a group than when working alone, because individual contributions are not identified and responsibility is diffused. It is reduced when each person's effort is identifiable and valued.
Diffusion of responsibility is the reduced sense of personal responsibility that occurs when others are present, because responsibility is spread across the group. It underlies social loafing and, as the next dot point shows, the bystander effect.
Deindividuation
Deindividuation is the loss of self-awareness and personal restraint that can occur when people are in a large group and feel anonymous. When individual identity is submerged in the crowd, people may act in ways they never would alone, often more impulsively or aggressively. Anonymity, group size and arousal increase deindividuation, which helps explain crowd behaviour, online trolling and mob violence.
Group polarisation and groupthink
Group discussion does not always moderate views; it often intensifies them.
- Group polarisation is the tendency for group discussion to strengthen the average view of the members, so the group's decision becomes more extreme than the individuals' initial positions. A group that leans cautious becomes more cautious; one that leans risky becomes riskier.
- Groupthink is a pattern of faulty decision-making in highly cohesive groups that value agreement over critical evaluation. Dissent is suppressed, alternatives are not examined, and the group develops an illusion of unanimity and invulnerability, leading to poor decisions.
Groupthink is marked by an illusion of invulnerability, pressure on doubters to conform, self-censorship of doubts, and a false sense of unanimity. Encouraging dissent, appointing a devil's advocate and seeking outside views are recognised ways to prevent it.
Why group processes matter
Group processes explain everyday and high-stakes behaviour: why teams sometimes underperform, why crowds turn violent, why committees make worse decisions than individuals, and why anonymous online groups behave badly. Understanding them allows organisations to design teams and decision processes that reduce loafing and groupthink and harness the benefits of working together.
A school group assignment
Five students are assigned a group project worth one combined mark.
If some members coast because their individual effort cannot be identified, that is social loafing driven by diffusion of responsibility.
If the group, all keen risk-takers, discuss the project and end up choosing a far riskier topic than any of them would have picked alone, that is group polarisation.
If the group ignores a member's sensible objection because everyone wants to seem agreeable and finish quickly, that is groupthink.
A precise answer names the specific process and the mechanism behind it.
- Confusing social loafing with social facilitation
- Loafing is reduced effort in groups; facilitation is improved performance on easy tasks when observed.
- Mixing up polarisation and groupthink
- Polarisation is the strengthening of the group's average view; groupthink is faulty decision-making from suppressing dissent for the sake of harmony.
- Treating deindividuation as the same as conformity
- Deindividuation is loss of self-restraint through anonymity in a crowd, not simply matching a group's behaviour.
- Forgetting the mechanisms
- Strong answers link loafing and the bystander effect to diffusion of responsibility, and deindividuation to anonymity.
Exam-style questions
Questions in the style of SCSA exam questions on this dot point, each with a worked answer. They are written by ExamExplained unless tagged "Past paper"; the year shows the paper a question is modelled on.
Original6 marksDistinguish between social loafing, deindividuation and groupthink, giving one example of each.Show worked answer →
A 6 mark distinguish answer needs the three processes clearly contrasted with examples.
- Social loafing
- Putting in less individual effort when working in a group than when alone, because individual contributions are not identified (diffusion of responsibility). Example: a student coasting in a group project marked as a whole.
- Deindividuation
- The loss of self-awareness and personal restraint when people feel anonymous in a large group, leading to impulsive or antisocial acts. Example: aggressive behaviour in an anonymous crowd or online.
- Groupthink
- Faulty decision-making in highly cohesive groups that value agreement over critical evaluation, suppressing dissent. Example: a committee ignoring a sensible objection to maintain harmony.
Markers reward the reduced-effort versus loss-of-restraint versus faulty-decision distinction and an apt example for each.
Original7 marksExplain groupthink, including its warning signs, and describe strategies that could prevent it in a decision-making group.Show worked answer →
A 7 mark extended response needs groupthink explained, its signs, and prevention strategies.
- Groupthink
- A pattern of faulty decision-making in highly cohesive groups where the drive for consensus overrides realistic appraisal of alternatives, so dissent is suppressed and poor decisions result.
- Warning signs
- An illusion of invulnerability, pressure on doubters to conform, self-censorship of doubts, and a false sense of unanimity.
- Prevention
- Encouraging open dissent, appointing a devil's advocate to argue against the favoured option, seeking views from outside the group, and having the leader withhold their own opinion early so members are not pressured to agree.
- Conclusion
- Markers reward a clear definition, the named warning signs, and practical strategies that protect critical evaluation.