Refactor and Refine
Being a real-world project, the interfaces between layers will naturally change and evolve as the project continues to be clarified and better understood. These ongoing improvements are to be expected; the code’s evolution is perfectly normal.[30] Your change process won’t be painful, though: your teams have worked together already, and you probably have developed a great rapport.
Many processes block off your project into phases, much like the old Waterfall development model. Waterfall development has a very strict set of phases, one after another: requirements, specifications, design, implementation, testing, and maintenance. Of course, using phases like this assumes that you have a perfect understanding of the problem ...
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