Statistical group

Societal group

Social group

Non-social group

In-groups

Out-groups

Primary group

Secondary groups

Reference groups

Purpose

Norm

Group norms

Prescriptive group norms

Proscriptive group norms

Role

Task roles

Socio-emotional roles

Communication network

Status

Sociometric structure

Cohesiveness

Group polarisation

Groupthink

Social facilitation

Social loafing

Social influence

Conformity (majority influence)

Informational social influence

Normative social influence

Minority influence

Obedience

Intergroup behaviour

Individual-level explanation

Frustration-aggression theory

Situational-level explanation

Social exchange theory

Equity theory

Positional level explanation

Realistic conflict theory

Social harmony

Relative-deprivation theory

Recourse mobilisation theory

Social identity theory (SIT)

Social identity

Social identity formation

Ideological-level explanation

Socio-economic roles