Usability heuristics
Skill Amey-Thakur/AI-SKILLS/skills/ui-ux/usability-heuristics
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Evaluate and design interfaces against established usability heuristics to catch the common, predictable UX failures. Use when reviewing a UI for problems or designing one to avoid them.
SKILL.md
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Usability heuristics
Most usability problems are the same handful of failures repeated. The heuristics (Nielsen's ten, and a few kin) are a checklist of what humans need from an interface; running a design against them catches predictable problems cheaply, before a single user is tested.
Method
- Show system status. The interface tells the user what is happening: loading states, progress, confirmation that an action worked, where they are. Silence after a click leaves the user guessing whether it registered (see empty-and-error-states, interaction-design). Feedback within the moment the user expects it.
- Match the real world. Use the user's language and mental model, not the system's internals. Labels, icons, and flows should map to how the user thinks about the task, not how the database is structured (see ux-writing, information-architecture).
- Give control and freedom. Undo, cancel, back, and clearly-marked exits. Users make mistakes and change their minds; an interface that traps them (no way out of a flow, irreversible actions with no confirmation) breeds anxiety and error. Support reversal (see interaction-design).
- Be consistent and follow standards. The same action looks and behaves the same everywhere; platform conventions (where the back button is, what a link looks like) are honored, not reinvented. Consistency lets users transfer what they learned (see design-systems).
- Prevent errors, and recover gracefully. Design so mistakes are hard to make (constraints, good defaults, confirmation for the destructive) and, when they happen, help the user fix them with clear, plain-language messages that say what to do (see empty-and-error-states, error-messages). Prevention beats a good error message.
- Reduce memory load and respect the expert. Show options rather than making users recall them; keep the interface minimal (every extra element competes for attention; see visual-hierarchy). At the same time, offer accelerators (shortcuts, defaults) so frequent users move fast. Recognition over recall, flexibility over rigidity.
Method note
Run a heuristic evaluation by walking the key flows and scoring each against these; a couple of evaluators find most issues. It complements, not replaces, watching real users (see usability-testing).
Boundaries
- Heuristics catch known problem classes; they miss domain-specific and discoverable-only-by-observation issues, which is why usability testing with real users is still needed (see usability-testing).
- Heuristics can conflict (minimalism vs discoverability, flexibility vs simplicity); resolving the tension is a design judgment for the specific users, not a rule to apply mechanically.
- Accessibility is a related but distinct requirement with its own standards; a heuristically-clean UI can still be unusable with a screen reader (see accessibility-review, aria-usage).