Strength) Supporting research in Asch's variations showed that when a dissenter gave the correct answer, conformity dropped significantly. Similarly in Milgram's study, the presence of a disobeying peer caused obedience to fall from 65% to 10%.
Limitation) Most supporting research was conducted in controlled lab environments which lack ecological validity. This means participants may behave differently in real life situations. This is important because it means the support coming from these studies is limited in it's application.
Strength) Research shows that people with an internal locus of control are more likely to resist pressure to conform or obey. Holland found that internals were less likely to obey in a replication of Milgram's study.