What is a use case vs scenario?

Question

Accepted Answer

**Use case** — general description. **Scenario** — specific instance.

**Use case:**
- Broad functionality.
- Multiple scenarios.
- General steps.
- Covers variations.

Scenario:
- Specific example.
- One path through use case.
- Concrete data.
- Testable.

**Example:**
```
Use Case: Authenticate User
Includes:
- Successful login
- Failed login (wrong password)
- Account locked
- Password reset

Scenario: Successful Login
1. User enters valid email
2. User enters correct password
3. System validates credentials
4. System creates session
5. User sees dashboard
```

**Key differences:**
- **Use case** — many scenarios.
- **Scenario** — one instance.

Business Analyst: What is a use case vs scenario?