What was your experience using the waterfall model in project implementation, and how effective was it?

The Waterfall model is a classic approach to project management, where the development process proceeds sequentially through stages: requirements analysis, design, implementation, testing, deployment, and maintenance.

In my experience with the Waterfall model, it is well-suited for projects with clearly defined and stable requirements, where changes are minimal. This allows for detailed planning and control of each stage.

However, in cases of changing requirements or the need for quick adaptation, the Waterfall model can be inefficient, as returning to previous stages is difficult and costly.

In such cases, more flexible methodologies (Agile, Scrum) are preferable.

Example: when developing an internal corporate application with a fixed set of features, the Waterfall model helped structure the work and avoid chaos. But when developing a client product with frequent requirement changes, it was necessary to switch to an iterative approach.