Sequence diagram
Booking system
Availability check, hold, confirm — the three-step pattern bookings need.
- Category
- Business
- Diagram type
- Sequence diagram
- Elements
- 4
- Connectors
- 7
What it is for
The hold step exists so two people cannot book the same slot while one is entering card details. Systems without it discover the need during their first busy day.
More about the sequence diagram makerWhen it helps
- Designing a reservation system
- Explaining why holds expire
- Reviewing a concurrency problem
