Subjects tend to obey if they perceive that the authority is legitimate. 2) Subjects tend to obey if the context is a prestigious institution like Yale. 3) Subjects tend to obey if the victim has been depersonalized (subject and confederate were separated at a distance). 4) Subjects tend to obey if no dissenter is present. Disobey if lack of obedience is seen from the start.
The tendency for people in a group to exert less effort when pooling their efforts toward attaining a common goal than when individually accountable.