Apply the cognitive and behavioral psychology behind design decisions — cognitive biases, behavioral economics (anchoring, framing, loss aversion, defaults, decoy effect, choice overload), Cialdini's principles of influence, the Fogg Behavior Model and Hook Model, self-determination theory, trust and credibility, the Kano model, and the ethics of persuasive design. Use when designing pricing pages, onboarding, habit or engagement loops, defaults and opt-ins, social proof, notifications, retention or cancellation flows, or when judging whether a pattern is persuasion or manipulation.
