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The development process has three stages:
Analysis: defining the scope of the problem to be solved
Design: creating an overall structure for a system
Implementation: writing and testing the code.
An iterative nature of this process is significant and suggests that these stages are not numbered.
Staff at all levels should be encouraged to talk regularly with individuals involved in "the other" stages of the development.
However, it is important to apply an appropriate degree of formality for a given project and to maintain an appropriate degree of separation between these phases.
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