21 male uni students, volunteered newspaper advert. Ppts selected who were physical and mental stable. Paid $15 a day. Each ppt randomly assigned to prisoner or guard.
Wanted to make as realistic as possible, turning basement of Stanford University into mock prison.
Prisoners’ taken from homes, real police arrested, fingerprinted, given a number, smock to wear, chains around ankles.
Guards given uniforms, dark reflective sunglasses, handcuffs and baton.