Free explainer5 min read
Group dynamics
Understand the model, recognise it in a stem, separate the look-alikes, then apply it.
Start with the mental model
A group can change behaviour in several exam-relevant directions: effort, risk, restraint, helping, or dissent. For example, a tight team that suppresses doubts to preserve agreement is showing groupthink; a crowd where nobody helps because everyone assumes someone else will is showing diffusion of responsibility in the bystander effect. In practice, avoid the tempting umbrella answer 'group pressure' and identify the specific mechanism.
Visual explanationUse the diagram to rebuild the concept from memory.
01Core model
Groupthink occurs when a cohesive, pressured group values agreement so strongly that dissent is silenced and poor decisions go unchallenged. Group polarisation means discussion pushes the group's existing tendency toward a more extreme position. Social loafing is reduced individual effort when personal contribution is hard to identify. Social facilitation improves simple, well-learned performance in the presence of others but impairs difficult or unfamiliar performance. Deindividuation reduces self-awareness and restraint under anonymity. The bystander effect is reduced helping when others are present, partly through diffusion of responsibility. Tuckman's group-development sequence is a separate framework: forming, storming, norming, performing, and sometimes adjourning. Kurt Lewin coined the term 'group dynamics' to describe how groups behave as systems distinct from the individuals within them. Group cohesion is the bond and sense of togetherness that keeps members working together toward a shared common goal. Asch's group theory holds that equality between members, meaning an absence of hierarchy, contributes to group disintegration rather than cohesion. Bion described basic-assumption group activity as an unconscious, defensive process that can operate alongside, and interfere with, the group's conscious 'working group' task. He named three basic-assumption states: dependency, pairing, and fight-flight. In dependency, the group looks to a leader to provide for and direct it, as a child looks to a parent. In pairing, the group unconsciously expects two members to produce a solution or a new leader, generating hope. In fight-flight, the group unconsciously unites against a perceived external threat through either aggression or avoidance.
02Recognise it in an SBA
• A multidisciplinary team now works efficiently together, roles are clear, and members focus on shared clinical tasks with little residual conflict. Which Tuckman stage is this?
• As a long-running therapy group nears its final planned session, members become quieter, discuss what they will miss, and some withdraw emotionally. Which Tuckman stage is this?
03Separate the look-alikes
| Groupthink | consensus pressure suppresses dissent, unlike group polarisation, which shifts opinions more extreme. |
|---|---|
| Social loafing | less effort in pooled group work, unlike social facilitation, where an audience changes performance. |
| Deindividuation | anonymity reduces restraint, whereas bystander effect reduces helping through diffusion of responsibility. |
| Tuckman stages | forming, storming, norming and performing describe group development, not decision biasA systematic error that skews a study's results away from the truth in a particular direction.Read more →. |
Bion's basic assumptions (dependency, pairing, fight-flight): unconscious defensive states, unlike Tuckman's forming-storming-norming-performing, which describes conscious task-group development. | |
How the exam thinksRead the question the way the examiner wrote it.
What people get wrong here
• Forming describes an early stage of politeness and leader dependence, not efficient joint working.
• Norming describes agreeing shared rules just before productive work begins, not efficient ongoing work.
• Storming describes ongoing conflict over roles, which this settled, low-conflict team has moved past.
• Forming describes an early stage of orientation, the opposite of ending seen in this vignette.
• Performing describes ongoing productive work, not the withdrawal described near the final session.
Deep diveStart from scratch, the full, beginner-friendly explanation.
**Each group phenomenon has a different signature, so match the vignette to the changed behaviour.**
For example, if a ward team becomes more confident in a risky discharge plan after discussing it together, that is group polarisation. If individual team members contribute less because the task is pooled and nobody can see their effort, that is social loafing. If a trainee performs a familiar task better while observed but makes more errors on a new task, that is social facilitation.
Clinically and organisationally, the practical antidote depends on the mechanism. Groupthink is reduced by inviting dissent and delaying the leader's own opinion. Social loafing is reduced by making contributions identifiable. The bystander effect is reduced by assigning a named person to act, rather than asking a crowd to help.
01GROUPTHINK (Janis) occurs in
GROUPTHINK (Janis) occurs in cohesive groups under pressure when consensus-seeking suppresses dissent, creates illusionsA misperception of a real external stimulus, such as mistaking a coat on a hook for a person.Read more → of unanimity/invulnerability and prevents appraisal of alternatives.
02GROUP POLARISATION moves the
GROUP POLARISATION moves the prevailing group attitude toward a more extreme position after discussion; 'risky shift' is one example.
03SOCIAL LOAFING is reduced
SOCIAL LOAFING is reduced individual effort when contributions are pooled and less identifiable.
04SOCIAL FACILITATION increases dominant
SOCIAL FACILITATION increases dominant responses: an audience improves simple/well-learned performance but impairs difficult/new tasks.
05DEINDIVIDUATION is reduced self-awareness
DEINDIVIDUATION is reduced self-awareness and restraint under anonymity or immersion.
06BYSTANDER EFFECT reflects diffusion
BYSTANDER EFFECT reflects diffusion of responsibility.
Worked application
Worked application: A multidisciplinary team now works efficiently together, roles are clear, and members focus on shared clinical tasks with little residual conflict. Which Tuckman stage is this? The best answer is “Performing: the group works productively and cohesively once roles and norms are firmly established.” because Performing describes a mature group working effectively together once roles and norms are settled.
The story in picturesPredict each next frame before you reveal it.
04Question-solving strategy
• Name the learning, social or research principle being tested before reading the options.
• Identify the antecedent, behaviour, consequence or cognitive process in the vignette.
• Compare the direction of effect with the nearest competing principle.
• Apply the same rule to a new example to confirm that the answer transfers.