Situational Ethics , a particular view of ethics that states: the morality of an act is a function of the state of the system at the time it is performed.
Situationist International (SI), an international political and artistic movement, active through the 1960s. 'Situationism' is the name generally given to the SI's distinctive political and cultural ideas; however this use is rejected by the SI and their contemporary followers.
Situationism (psychology) , an approach to personality that holds that people are more influenced by external, situational factors than by internal traits or motivations.