What is the difference between structured analysis and object-oriented analysis?

Question

Accepted Answer

**Structured** — process-focused. **OO** — object-focused.

**Structured Analysis:**
- Process-oriented.
- Data flow diagrams.
- Functional decomposition.
- Top-down approach.
- Older methodology.

```
Structured Approach:
- Data Flow Diagrams (DFD)
- Entity-Relationship Diagrams (ERD)
- Structured English
- Decision Tables
```

**Object-Oriented Analysis:**
- Object-oriented.
- Use case diagrams.
- Class diagrams.
- Bottom-up approach.
- Modern methodology.

```
OO Approach:
- Use Case Diagrams
- Class Diagrams
- Sequence Diagrams
- UML notation
```

**Key differences:**
- **Structured** — processes.
- **OO** — objects.
- **Structured** — data flow.
- **OO** — behavior.

Systems Analyst: What is the difference between structured analysis and object-oriented analysis?