The Waterfall Model and Spiral Model are two prominent software development methodologies, each with distinct characteristics and applications.

Waterfall Model

The Waterfall Model is a linear and sequential approach to software development. It is often referred to as the classical or linear model because it follows a top-down approach, where each phase must be completed before moving on to the next. The phases typically include requirement analysis, design, implementation, testing, deployment, and maintenance¹².

Key Features

• Sequential Process: Each phase must be completed before the next one begins.

• Minimal Flexibility: Changes are difficult to accommodate once a phase is completed.

• Low Customer Involvement: Customer feedback is usually obtained only at the end of the development process.

• Cost-Effective: Generally less expensive compared to other models¹.

Advantages