1. Asch introduced a dissenting confederate- sometimes they gave the correct answer and sometimes a different wrong answer (but always disagreed with majority)
2. In the presence of a dissenter, conformity reduced on average to lessthana quarter of the level it was when the majority was unanimous
One limitation is that the situation and task were artificial. Participants knew they were in a research study (demand characteristics) The task was trivial and there was no reason not to conform
Another limitation is that Asch's findings have little application. Only American men were tested by Asch. Neto (1995) suggested that women might be more conformist, possibly because they are more concerned about social relationships (and being accepted). Also the US is an individualist culture and studies in collectivist cultures (e.g. China) have found higher conformity rates (Bond and Smith 1996).
One strength is other evidence to support Asch's findings. Lucas et al. (2006) asked participants to solve 'easy' and 'hard' maths problems. Participants were given answers that falsely claimed to be from three other students. The participants conformed more often (agreed with the wrong answers) when the problems were harder.
Conformity is more complex than Asch thought. Lucas et al's study showed that conformity was related to confidence (high confidence-less conformity). This shows that individual-level factors interact with situational ones but Asch did not investigate individual factors.
Asch's research raises ethical issues. Asch's research increased our knowledge of why people conform which may help avoid mindless destructive conformity. But when participants are deceived they cannot give their informedconsent to take part and may have a negative experience.
Asch (1951) found many participants conformed rather than give the correct answer because they were afraid of disapproval. When participants wrotedown answers (no normative pressure) conformity fell to 12.5%
Lucas et al. (2006) found participants conformed more to incorrect answers when maths problems were difficult. With easy problems, participants knew their own minds.
It is unclear if NSI or ISI operate in studies and real life. A dissenter may reduce the power of NSI (social support) or reduce the power of ISI (alternative source). Therefore ISI and NSI are hard to separate and operate together in most real-world situations
Some people are concerned about being liked by others - affiliators who have a strong need for 'affiliation' (need to relate to other people). McGhee and Teevan (1967) found that students who were nAffiliators were more likely to conform
The study was stopped after six days instead of the planned 14 days. Social roles are powerful influences on behaviour-most conformed strongly to their role. Guards became brutal, prisoners became submissive.
Emotionally-stable participants were recruited and randomly allocated the roles of guard or prisoner. The guards and prisoners had those roles only by chance so their behaviour was due to the role itself and not their personalities
Banuaziri and Mohaved (1975) suggest participants were play-acting. Their performances reflected stereotypes of how prisoners and guards are supposed to behave
Only a third of the guards behaved brutally. Another third applied the rules fairly. The rest supported the prisoners, offering them cigarettes and reinstating privileges. This suggests the SPE overstates the view that the guards were conforming to a brutal role and minimiseddispositional influences (personality)