This document summarizes key points from a presentation on threat-rigidity effects in organizational behavior. It discusses how environmental threats can lead to rigidity in response at the individual, group, and organizational levels. At the individual level, threats increase stress, anxiety, and physiological arousal. At the group level, threats increase pressure toward uniformity and self-censorship. At the organizational level, threats lead to restricting information flow and a shift toward centralized control. The presentation provides models showing how threats can amplify rigid responses across multiple levels from the individual to the group to the organization.