The procedure of Zimbardo's Stanford prison study (1973)
> the Stanford prison study - a mock prison in the basement of Stanford university USA.
>a controlled observation
>24 male students from a volunteer sample
>all volunteers were physically and psychologically screened
>participants were randomly allocated to either the role of prisoner or guard
>Zimbardo played the role of both prison supervisor and also running the experiment
>the experiment was planned to last 14 days