Intrinsic Load     — Complexity inherent to the task itself
Extraneous Load    — Unnecessary complexity from poor design (eliminate this!)
Germane Load       — Mental effort for learning/understanding (support this)

Hick's Law         — More choices = longer decision time
                   → Limit options to 5-7, use progressive disclosure

Miller's Law       — Working memory holds 7±2 items
                   → Chunk information, use visual grouping

Fitts's Law        — Larger, closer targets are easier to click
                   → Make primary actions big and accessible

Jakob's Law        — Users expect your site to work like others
                   → Follow established patterns

Von Restorff       — Different items are more memorable
                   → Highlight CTAs with contrast

Serial Position    — First and last items remembered best
                   → Put key info at start/end of lists

Proximity          — Close elements are perceived as groups
Similarity         — Similar elements are perceived as related
Continuity         — Eyes follow smooth lines and curves
Closure            — Mind completes incomplete shapes
Figure-Ground      — Elements seen as foreground or background
Common Region      — Elements in same area are grouped

1. Define scope         — What screens/flows to evaluate
2. Select evaluators    — 3-5 UX experts (80%+ issues found)
3. Independent review   — Each expert reviews alone
4. Apply heuristics     — Rate severity for each issue
5. Consolidate          — Merge findings, remove duplicates
6. Prioritize           — Rank by severity × frequency
7. Report               — Actionable recommendations

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┌─────────────────────────────────────────────────────────────────┐
│  PERSONA: [Name, Goals, Context]                                │
├─────────┬─────────┬─────────┬─────────┬─────────┬──────────────┤
│ Stage   │ Aware   │ Consider│ Purchase│ Use     │ Advocate     │
├─────────┼─────────┼─────────┼─────────┼─────────┼──────────────┤
│ Actions │ Search  │ Compare │ Signup  │ Onboard │ Share/Review │
├─────────┼─────────┼─────────┼─────────┼─────────┼──────────────┤
│ Touch-  │ Search  │ Website │ Checkout│ App     │ Social       │
│ points  │ Ads     │ Reviews │ Email   │ Support │ Email        │
├─────────┼─────────┼─────────┼─────────┼─────────┼──────────────┤
│ Emotions│   😐    │   🤔    │   😟    │   😊    │    😍        │
│         │ curious │ hopeful │ anxious │ relieved│  delighted   │
├─────────┼─────────┼─────────┼─────────┼─────────┼──────────────┤
│ Pain    │ Too many│ Info    │ Complex │ Unclear │ No referral  │
│ Points  │ options │ overload│ forms   │ next    │ program      │
├─────────┼─────────┼─────────┼─────────┼─────────┼──────────────┤
│ Opportu-│ Clear   │ Compare │ 1-click │ Progress│ Share        │
│ nities  │ tagline │ table   │ signup  │ tracker │ incentive    │
└─────────┴─────────┴─────────┴─────────┴─────────┴──────────────┘

For each touchpoint, evaluate:

1. Entry Point      — How do users arrive?
2. User Goal        — What are they trying to accomplish?
3. Friction         — What slows them down?
4. Emotion          — How do they feel?
5. Drop-off Risk    — Where might they abandon?
6. Opportunity      — How can we improve?

Perceivable     — Can users perceive the content?
                  ✓ Text alternatives for images
                  ✓ Captions for video
                  ✓ 4.5:1 color contrast
                  ✓ Resizable text (up to 200%)

Operable        — Can users operate the interface?
                  ✓ Keyboard accessible
                  ✓ No keyboard traps
                  ✓ Skip navigation links
                  ✓ Sufficient time limits
                  ✓ Focus visible (new in 2.2!)

Understandable  — Can users understand the content?
                  ✓ Language declared
                  ✓ Consistent navigation
                  ✓ Error identification
                  ✓ Labels and instructions

Robust          — Works with assistive technology?
                  ✓ Valid HTML
                  ✓ ARIA landmarks
                  ✓ Status messages announced

Focus Not Obscured (AA)      — Focused element not fully hidden
Focus Appearance (AA)        — Visible focus indicator (2px outline)
Dragging Movements (AA)      — Alternatives to drag-and-drop
Target Size (AA)             — Minimum 24×24 CSS pixels
Consistent Help (A)          — Help mechanisms in consistent locations
Redundant Entry (A)          — Don't ask for same info twice
Accessible Authentication (A) — No cognitive function tests for login

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Purpose of micro-interactions:
1. Feedback      — Confirm user action (button click, form submit)
2. Status        — Show current state (loading, progress)
3. Guidance      — Direct attention (onboarding tooltips)
4. Delight       — Create emotional connection (subtle animations)

Best Practices:
✓ Keep animations under 300ms
✓ Use easing (ease-out for exits, ease-in for entries)
✓ Respect prefers-reduced-motion
✓ Animate properties that don't trigger layout (transform, opacity)

Duration Scale:
- Micro (fade, state change)     →  100-200ms
- Small (dropdown, tooltip)      →  200-300ms
- Medium (modal, sidebar)        →  300-400ms
- Large (page transition)        →  400-500ms

Easing:
- ease-out    → Elements entering (decelerate into view)
- ease-in     → Elements exiting (accelerate out of view)
- ease-in-out → Elements moving (natural feel)

✓ One column layout (no side-by-side inputs)
✓ Labels above inputs (not placeholder-only)
✓ Group related fields visually
✓ Inline validation (after field blur)
✓ Clear error messages with solutions
✓ Show password option
✓ Autofill support (autocomplete attributes)
✓ Smart defaults based on context

Every interactive component needs:

Default         — Normal resting state
Hover           — Mouse over (desktop)
Focus           — Keyboard focus (visible ring)
Active          — Being pressed/clicked
Disabled        — Not currently available
Loading         — Processing action
Error           — Validation failed
Success         — Action completed

{
  "color": {
    "text": {
      "primary": "#1a1a1a",
      "secondary": "#6b6b6b",
      "disabled": "#a3a3a3",
      "inverse": "#ffffff"
    },
    "interactive": {
      "default": "#0066cc",
      "hover": "#0052a3",
      "active": "#003d7a",
      "focus": "#0066cc"
    },
    "feedback": {
      "error": "#d32f2f",
      "warning": "#f57c00",
      "success": "#388e3c",
      "info": "#1976d2"
    }
  },
  "spacing": {
    "xs": "4px",
    "sm": "8px",
    "md": "16px",
    "lg": "24px",
    "xl": "32px"
  },
  "radius": {
    "sm": "4px",
    "md": "8px",
    "lg": "16px",
    "full": "9999px"
  }
}

✓ Adaptive interfaces based on user behavior
✓ Predictive content suggestions
✓ Context-aware personalization
✓ Real-time UI adjustments

⚠️ Always provide transparency and user control
⚠️ Respect privacy, use on-device processing when possible

Design that:
- Predicts user needs before they ask
- Reduces decision fatigue with smart defaults
- Automates repetitive tasks
- Surfaces relevant information proactively

Example: Pre-filling shipping address based on previous orders

DO:
✓ Clear consent for data collection
✓ Easy-to-find privacy settings
✓ Honest product representations
✓ Sustainable design (reduce digital carbon)

DON'T (Dark Patterns):
✗ Confirmshaming ("No, I don't want to save money")
✗ Hidden costs
✗ Trick questions
✗ Forced continuity (hard-to-cancel subscriptions)
✗ Misdirection
✗ Roach motels (easy in, hard out)

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