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My instructions to the guards, as documented by recordings of the guard orientation, were that they could not hit the prisoners but could create feelings of boredom, frustration, fear, and "a sense of powerlessness—that is, we have total power of the situation, and they have none." We did not give any formal or detailed instructions about how to be an effective guard.

Asking a person role-playing a guard in a prison simulation to be "firm" and "in the action" is mild compared to the pressure exerted by actual wardens and superior officers in real-life prison and military settings, where guards failing to participate fully can face disciplinary hearings, demotion, or dismissal. Although the research team asked all guards to be actively involved and firmly in control of the prisoners, it never instructed guards to employ brutality, and it explicitly banned the use of physical force.

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