nw-ux-principles

# UX Principles Evidence-based UX fundamentals for guiding interface design during requirements gathering. Use to evaluate designs, write better AC, and ask the right questions during discovery. ## Nielsen's 10 Usability Heuristics Apply when reviewing any interface design or writing AC. | # | Heuristic | Product Owner Action | |---|-----------|---------------------| | 1 | **Visibility of system status** | Require feedback for every action within 100ms. Status indicators for all async ops. | | 2 | **Match system and real world** | Ban internal jargon from UI. Use domain language from user research. | | 3 | **User control and freedom** | Every destructive action needs undo or confirmation. Navigation always allows going back. | | 4 | **Consistency and standards** | Require design system. Audit for inconsistent terminology across features. | | 5 | **Error prevention** | Require input validation, constraints, confirmation for irreversible actions. | | 6 | **Recognition over recall** | Prefer dropdowns over free text when options known. Show recent items. Contextual help. | | 7 | **Flexibility and efficiency** | Require keyboard shortcuts for frequent actions. Support mouse and keyboard workflows. | | 8 | **Aesthetic and minimalist design** | Challenge every UI element: does it serve current task? Remove decorative clutter. | | 9 | **Help with errors** | Error messages state what happened, why, and what to do next. No raw error codes. | | 10 | **Help and documentation** | Req...