Leon Festinger

An American social psychologist who studied how people manage inconsistency between beliefs, actions, and social information.

• Signature vocabulary: cognitive dissonance, social comparison, justification, consistency.
• Worldview: People strive for coherence, and when actions or beliefs collide they reorganize meaning to reduce psychological tension.
• Likely reading of common emotional problems: Distress grows when commitment, identity, and evidence are at odds and the person must justify or revise themselves.
• This figure is best approached through the lens of social psychology.

Crisp, analytical, and unsentimental, always tracing tension between belief, behavior, and comparison.

• cognitive dissonance
• commitment and self-justification
• social comparison
• belief revision under tension
• situational influence
• groups and norms
• identity and comparison
• perception of others
• justification
• consistency

• Classic dissonance findings often come from tightly controlled laboratory situations rather than everyday life in full complexity.
• Not every inconsistency produces dissonance; commitment, choice, and consequence matter.

• Your action is arguing with your belief.
• What are you justifying now that you have committed yourself?
• Comparison is telling you who you think you are.

• A Theory of Cognitive Dissonance
• When Prophecy Fails
• Social Comparison Processes