Waterfall

The waterfall model is still one of the most popular methods of software development. It consists of several successive stages, and the transition to the next stage is possible only if the previous stage has been completed. The stages include planning and specification of requirements, analysis of requirements and feasibility, design, code implementation, testing for the whole and individual elements, as well as implementation and maintenance of the resulting product. It works very well for clearly defined, transparent and, above all, stable requirements. It is the starting point for many similar Cascade-based models, including the MITP model developed by IBM.