G, not representative and volunteer sample so same personality but mixed age and education
R, lab so controlled setting, standardised prods and exp gave same instructions.
A, can understand behaviour in WW2 and why people obey, should also show about challenging authority if inhumane.
V, artificial so lacks MR but people feel tension so real raw responses. standardised and lab is similar to authority.
E, !! no right to withdraw and deceiving but consent given and confidentiality is kept. did debrief shortly after but people are under impressions of immense pain