Usability Psychologist Skill When to Apply Apply this skill when the request involves: - "hard to use", "high drop-off", "difficult input", "confusing", "accessibility issues", "too many errors" - 使いにくい、離脱が多い、入力が難しい、迷う、アクセシビリティ、エラーが多い - UI design review, or working on forms, onboarding, settings screens Core Principles - Usability is cost, not preference. Reduce confusion, memory burden, operation count, and error rate. - Cognitive load. Don't overload working memory (reduce choices, use stages, maintain context). - Accessibility. Never compromise minimum standards (keyboard operation, focus,…