1. Procedure - 123 American male student volunteer participants were tested in groups, with only one being a genuine participant and the others being confederates
2. Findings - Participants conformed in 36.8% of critical trials
3. Conclusions - Provides strong evidence for compliance and normative social influence
1. Procedure - 24 male student participants were randomlyallocated to the role of prisoner or guard, and went through a process of experiencing deindividuation
2. Findings - Both prisoners and guards quickly conformed to their social roles
Participants were emotionally stable and without a criminal history
Guards and prisoners went through a process of experiencing deindividuation as they were given clothing and experiences that removed their personal identity
Guards wore uniforms, mirrored sunglasses and carried truncheons
Prisoners were 'arrested', stripped-searched and dressed in degrading smock uniforms
Prisoners were referred to by a number; not by their names and had 16 rules to follow which were enforced by the guards
Guards were instructed to keep prisoners under control without using physical violence
Guards had complete power over the prisoners, even deciding when they could go to the toilet
Zimbardo acted as the Head of the Prison, giving direction to the guards and managing prisoners
People have become more independent but also more external over time, challenging the link between internal locus of control and resistance to social influence
88% of participants rebelled when working in groups to produce evidence for a smear campaign, showing that support from peers is linked to greater resistance to obedience
1. Female participants recruited, placed in groups of 6 with 4 genuine participants and 2 confederates, shown blue slides and asked to state the colour
2. Consistent minority condition - confederates called all slides green
3. Inconsistent minority condition - confederates called 24/36 slides green