What is a use case specification?

Question

Accepted Answer

**Use case specification** — detailed description of a use case.

**Sections:**
- Use case name.
- Actors.
- Description.
- Preconditions.
- Postconditions.
- Main flow.
- Alternative flows.
- Exception flows.

**Example:**
```
Use Case: Place Order
Actors: Customer, System
Precondition: User logged in, items in cart
Main Flow:
1. User clicks Checkout
2. System displays order summary
3. User enters shipping info
4. User enters payment info
5. System processes payment
6. System confirms order
Postcondition: Order created
Alternative Flow:
5a. Payment fails
5b. System displays error
5c. User retries payment
```

**Benefits:**
- Comprehensive documentation.
- Clear requirements.

Business Analyst: What is a use case specification?