ux-principles_skill

Overview

This skill packages practical UX principles for designing usable, accessible, and human-centered digital products. It covers user research, usability heuristics, cognitive psychology, accessibility, testing methods, and metrics to guide iterative design. Use it to align product decisions with real user needs and measurable outcomes.

How this skill works

The skill inspects interfaces and workflows through established heuristics (Nielsen's 10), Gestalt visual principles, and cognitive rules like Fitts's Law and cognitive load theory. It translates research findings into actionable changes: wireframe recommendations, usability test plans, accessibility checks, and UX metrics to track improvements. Outputs focus on prioritized fixes, experiment ideas, and measurable success criteria.

When to use it

• Designing or iterating a user interface to reduce friction and errors
• Planning and running user research or usability testing
• Auditing accessibility and inclusive design gaps
• Defining UX metrics and measuring product performance
• Creating information architecture, personas, or journey maps

Best practices

• Start with user-centered research: observe tasks before designing
• Use low-fidelity prototypes and iterate based on real user feedback
• Prioritize visibility of system status and clear error messages
• Reduce cognitive load: chunk content, use progressive disclosure, and defaults
• Follow consistency, platform conventions, and clear signifiers
• Measure changes with concrete metrics: task completion, time, errors, satisfaction

Example use cases

• Running a heuristic review to surface top usability fixes before a redesign
• Designing onboarding that matches user mental models and reduces drop-off
• Creating accessible forms with inline validation and clear recovery paths
• Defining A/B tests for layout changes using task completion and time metrics
• Building a design system that enforces consistency and reusable signifiers