This document defines and describes several social forces and phenomena: conformity (normative and informational), obedience, diffusion of responsibility, deferral of responsibility to authority, power of the situation, social facilitation, social loafing, risky shift, and groupthink. Conformity refers to going along with a group to be liked or see them as a source of information. Obedience involves following authority figures to avoid punishment. Diffusion of responsibility means feeling less responsible as part of a group. The power of the situation impacts individual behavior. Social facilitation means performing better when observed, while social loafing means performing worse in groups. Risky shift and groupthink can lead groups to make riskier or poorer decisions than individuals