Explain in detail the classical waterfall model with help of a neat and labelled diagram.

Question

**Explain in detail the classical waterfall model with help of a neat and labelled diagram.**

Accepted Answer

### Solution

#### Classical Waterfall Model (Winston Royce, 1970) - Detailed

**Diagram:**
```
Requirements Analysis & Specification
        ↓  (SRS Document)
System & Software Design
        ↓  (Design Docs)
Implementation (Coding)
        ↓  (Code)
Testing (Verification)
        ↓  (Test Report)
Deployment
        ↓
Maintenance
```
Each phase **feeds** next; verification at each gate; no overlap.

**Phases in Detail:**

1. **Requirements** - Elicit, analyze, specify, validate → SRS. Output: SRS.
2. **Design** - Architecture, DFD, ERD, modular decomposition, interface specs. Types: High-level & Detailed.
3. **Implementation** - Code as per standards, unit testing per module.
4. **Testing** - Integration + System testing against SRS; alpha/beta.
5. **Deployment** - Delivery, installation, user training.
6. **Maintenance** - Corrective, Adaptive, Perfective, Preventive (60% of lifecycle cost).

**Advantages:** Simple, easy to manage, document-driven, suitable for small stable projects.

**Limitations:** No working model till late, high risk, poor for changing requirements, not suitable for large complex/OO projects.

Solution

Classical Waterfall Model (Winston Royce, 1970) - Detailed

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