- Mock prison set up in basement of psychology department - Stanford Uni in USA
- Male student volunteers psychologically and physically screened
- 24 most stable randomly assigned to be 'prisoner' or 'guard'
- prisoners unexpectedly arrested at home, entered prison
- put through delousing procedure, prison uniform, ID number assigned
- guards referred to them by numbers
- given rights like 3 meals, 3 supervised toilet trips a day, 2 visits per week
- ppts with role of guard - given uniform, clubs, whistles, reflective glasses (to prevent eye contact)
- Zimbardo \= prison superintendent
- planned to last 2 weeks