Theory on which the study is based - Social power is the influence individuals have to change others' thoughts, feelings or behaviours. Authority, legitimate or illegitimate, has social power to influence lower social status within their hierarchy. We strongly desire to obey legitimate authority, no matter our beliefs, feelings or intentions. Defiance involves rejecting social influence or power to follow our own internal attitudes, morals and beliefs. Defiance to unjust authority is needed for social progress.