80/20 rule -- Accessibility -- Advance organizer -- Aesthetic-usability effect -- Affordance -- Alignment -- Anthropomorphic form -- Archetypes -- Area alignment -- Attractiveness bias -- Baby-face bias -- Biophilia effect -- Cathedral effect -- Chunking -- Classical conditioning -- Closure -- Cognitive dissonance -- Color -- Common fate -- Comparison -- Confirmation -- Consistency -- Constancy -- Constraint -- Contour bias -- Control -- Convergence -- Cost-benefit -- Defensible space -- Depth of processing -- Design by committee -- Desire line -- Development cycle -- Entry point -- Errors --Expectation effect -- Exposure effect -- Face-ism ratio -- Factor of safety -- Feedback loop -- Fibonacci sequence -- Figure-ground relationship -- Fitts' law -- Five hat racks -- Flexibility-usability tradeoff -- Forgiveness -- Form follows function -- Framing -- Freeze-flight-fight-forfeit -- Garbage in-garbage out -- Golden ratio -- Good continuation -- Gutenberg diagram -- Hick's law -- Hierarchy -- Hierarchy of needs -- Highlighting -- Horror vacui -- Hunter-nurturer fixations -- Iconic representation -- Immersion -- Inattentional blindness -- Interference effects -- Inverted pyramid -- Iteration -- Law of Prägnanz -- Layering -- Legibility -- Life cycle -- Mapping -- Mental model -- Mimicry -- Mnemonic device -- Modularity -- Most advanced yet acceptable -- Most average facial appearance effect -- Normal distribution -- Not invented here -- Nudge -- Ockham's razor -- Operant conditioning -- Orientation sensitivity -- Performance load -- Performance versus preference -- Personas -- Picture superiority effect -- Priming -- Progressive disclosure -- Propositional density -- Prospect-refuge -- Prototyping -- Proximity -- Readability -- Recognition over recall -- Red effect -- Redundancy -- Rosetta stone -- Rule of thirds -- Satisficing -- Savanna preference -- Scaling fallacy -- Scarcity -- Self-similarity -- Serial position effects -- Shaping -- Signal-to-noise ratio -- Similarity -- Stickiness -- Storytelling -- Structural forms -- Symmetry -- Threat detection -- Three-dimensional projection -- Top-down lighting bias -- Uncanny valley -- Uncertainty principle -- Uniform connectedness -- Veblen effect -- Visibility -- Visuospacial resonance -- von Restorff effect -- Wabi-sabi -- Waist-to-hip ratio -- Wayfinding -- Weakest link.