Waterfall Model
The Waterfall Model is a linear and sequential software development methodology where each phase (e.g., requirements, design, implementation, testing, deployment, maintenance) must be completed before the next begins, with minimal overlap or iteration. It emphasizes thorough documentation and upfront planning, making it highly structured and predictable. This approach is often contrasted with agile methodologies, which are more flexible and iterative.
Developers should learn the Waterfall Model for projects with well-defined, stable requirements and low uncertainty, such as government contracts, safety-critical systems (e.g., medical devices), or large-scale infrastructure where changes are costly. It is useful when regulatory compliance or extensive documentation is required, as it provides a clear, auditable trail from conception to delivery. However, it is less suitable for dynamic projects where requirements may evolve, as it lacks the adaptability of agile methods.