UX Design Principles Guide
Core principles, Nielsen heuristics, methods, and design checklist.
Core Principles
User-Centered Design
Design for user needs, not assumptions
Example: User research, personas, testing
Consistency
Same patterns throughout interface
Example: Same button style, navigation
Feedback
System responds to user actions
Example: Button hover, loading states
Simplicity
Remove unnecessary complexity
Example: Clear hierarchy, minimal steps
Accessibility
Usable by all abilities
Example: Screen reader friendly, contrast
Visibility
Important elements clearly visible
Example: Primary action prominent
Nielsen Heuristics
Visibility of System Status
Keep users informed about what's happening
Match Real World
Use familiar concepts, natural language
User Control
Give users control, allow undo/reverse
Consistency & Standards
Follow platform conventions
Error Prevention
Design to prevent errors before they occur
Recognition over Recall
Minimize memory load, make options visible
UX Methods
User Interviews
Understand needs, motivations directly
Surveys
Quantitative feedback from many users
Usability Testing
Test interface with real users
A/B Testing
Compare design alternatives
Personas
Representative user profiles
Wireframing
Low-fidelity layout sketches
Design Checklist
Clear visual hierarchy
Consistent patterns
Accessible to all users
Feedback on interactions
Error prevention/recovery
Mobile-responsive
Fast loading
User tested
UX Design Tips
Design for users (research first). Keep it simple (remove friction). Be consistent (patterns matter). Provide feedback (show system response). Prevent errors (better than recovery). Test with real users (not assumptions). Iterate based on data. Consider accessibility (all abilities). Good UX = user achieves goal easily + enjoys experience.