Obedience: Low internal validity
P: One limitation is that Milgram's procedure may not have been testing what he intended to test.
E: Orne and Holland (1968) argued that participants behaved as they did because they didn't really believe in the set up, so they were 'play-acting'.Perry (2013) listened to the tapes from Milgram's experiment and confirmed this, only half of them believed the shocks were real.
E: 2/3 of these participants were disobedient.
L: Suggests that participants may have been responding to demand characteristics, trying to fulfil the aim of the study.
H: Sheridan and King (1972) conducted a study using a procedure like Milgram. Participants gave shocks to a puppy. Despite distress of the puppy 54% men and 100% women gave fatal shock. This suggests that the effects in Milgram's study were genuine because people behaved obediently even when the shocks were real.