UX Sequence Diagram
A skill that visualizes interaction sequences and system communications as ASCII diagrams.
When to Use
- •Defining user-system interaction sequences
- •Documenting API call sequences
- •Representing event flows between components
- •Designing asynchronous operation sequences
Sequence Diagram Symbols
Participants
code
┌───────┐ ┌───────┐ ┌───────┐
│ User │ │ UI │ │Server │
└───┬───┘ └───┬───┘ └───┬───┘
│ │ │
Message Types
code
────────→ Sync Request ← ─ ─ ─ ─ Sync Response - - - - → Async Request ═══════→ Critical Message ──────X Failed/Cancelled
Sequence Patterns
Basic Request-Response
code
┌───────┐ ┌───────┐ ┌───────┐
│ User │ │ UI │ │Server │
└───┬───┘ └───┬───┘ └───┬───┘
│ │ │
│ Click Button │ │
│─────────────────→│ │
│ │ API Request │
│ │─────────────────→│
│ │ Response Data │
│ │← ─ ─ ─ ─ ─ ─ ─ ─ │
│ Update View │ │
│← ─ ─ ─ ─ ─ ─ ─ ─ │ │
↓ ↓ ↓
Constraints
- •Participants arranged left-to-right, closest to user first
- •Time flows top-to-bottom
- •Clearly distinguish sync/async messages