The three independent variables in the BBC Prison Study took the form of 'planned interventions'. These were:

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The three independent variables in the BBC Prison Study were permeability (whether group boundaries are perceived as permeable or impermeable), legitimacy (whether the social system is perceived as legitimate), and cognitive alternatives (whether there are perceived alternatives to the current social system). These factors were manipulated as planned interventions to study their effects on group behavior and social identity.

The Three Independent Variables in the BBC Prison Study Took