The variations investigating proximity were done under controlledconditions in the lab, so have highreliability.
In Milgram's variation where the experimenter left the room and gave telephoneinstructions, obedience dropped to 20.5%. Supporting proximity as a situational variable.
Milgram's variation with 'touchproximity' where teachers had to put learners hands on an electric shock plate, saw obedience levels drop to 30%. This supports proximity as a situational variable.
Milgram's variation where the teacher and learner where seated in the same room, showed obedience levels to drop (40%). This supports proximity as a situational variable.