Waterfall model.

 The Waterfall model is a sequential approach to software development, where each phase of the project must be completed before moving on to the next. The phases of the Waterfall model are:


  1. Requirements gathering: This involves gathering and documenting the requirements for the software project from stakeholders.

  2. Design: This involves creating a high-level design of the software, including the architecture and component design.

  3. Coding: This involves writing the source code for the software based on the design.

  4. Testing: This involves verifying that the software meets the requirements and works as expected.

  5. Deployment: This involves installing and configuring the software in the production environment.

  6. Maintenance: This involves fixing bugs, adding new features, and keeping the software up-to-date.


The main advantage of the Waterfall model is its simplicity and predictability, as each phase of the project has a well-defined start and end point. However, it also has some disadvantages, such as inflexibility in accommodating changes in requirements, a lack of focus on collaboration and communication between team members, and a lack of feedback from users during the development process. Despite its limitations, the Waterfall model is still widely used, especially in projects where the requirements are well-understood and unlikely to change.

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