One strength is that Milgram's own studies support the role of the agentic state in obedience
Most of his PPs resisted giving the shocks at some point, and often asked the Experimenter questions about the procedure e.g. Who is responsible if Mr Wallace (the learner) is harmed?
Experimenter replied I'm responsible - PPs often went through with the procedure quickly with no further objections.
Shows that one PPs perceived they were no longer responsible for their own behaviour, acted more easily as the Experimenter's agent - as Milgram suggested
Low internal validity
One limitation is that Milgram's procedure may not have been testing what he intended to test
However, Sheridan and King conducted a study using a procedure like Milgram's. PPs (all students) gave real shocks to a puppy in response to orders from an experimenter. Despite the real distress of the animal, 54% of the men and 100% of the women gave what they thought was a fatal shock. This suggests that the effects in Milgram's study were genuine because people behaved obediently even when the shocks were real.
Milgram's conclusions about blind obedience may not be justified
The PPs in this study were deceived. For example, they thought that the allocation of roles (Teacher and Learner) was random, but in fact it was fixed. They also thought the shocks were real. Milgram dealt with this by debriefing PPs. However, Baumrind criticised Milgram for deceiving his PPs. She objected because she believed that deception in psychological studies can have serious consequences for PPs and researchers
Cross-cultural replications
Milgram's findings have been replicated in other cultures
Suggests Milgram's findings about obedience are not just limited to Americans or men, but are valid across cultures and apply to women
However, replications of Milgram's research are not very 'cross-cultural'. Smith and Bond identified just two replications between 1968 and 1985 that took place in India and Jordan - both countries quite different from the US. Whereas the other countries involved (e.g. Spain, Australia, Scotland) are quite culturally similar to the US (e.g. they have similar notions about the role of authority). Therefore, it may not be appropriate to conclude that Milgram's findings (including those about proximity, location and uniform) apply to people in all or most cultures
Low internal validity
One limitation is that PPs may have been aware that the procedure was faked
In all of Milgram's studies it is unclear whether the findings are genuinely due to the operation of obedience or because PPs saw through the deception and just 'play-acted' (responded to demand characteristics)