There is a large number of life-cycles around. You need to be aware of their strengths and weaknesses, and the subtle ways they can (be used to) louse up projects. A fervent belief on a particular life-cycle untrammeled by any concern for its weakness is an early danger sign in a project manager.
Remember that life-cycles only exist as models; they’re simply attempts at describing what we do.
Who Cares about Process Models?
Life-cycle or process models are only useful in that they help us think about how we develop systems.
If we fail to have any process we get chaotic. If we have the wrong process we can at least rethink it.
In the end process models subtly influence thinking. What matters in any project is that the artefacts: specifications, code, manuals, and tests get written, tested, and used.
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