C H A P T E R  2

Process Life Cycle Models

If you don't know where you're going, any road will do.

If you don't know where you are, a map won't help.

- Watts Humphrey

Every program has a life cycle. It doesn't matter how large or small the program is, or how many people are working on the project – all programs go through the same steps:

  1. Conception
  2. Requirements gathering/exploration/modeling
  3. Design
  4. Coding and debugging
  5. Testing
  6. Release
  7. Maintenance/software evolution
  8. Retirement

One's program may compress some of these steps, or combine two or more steps into a single piece of work, but all programs go through all steps.

Although every program has a life cycle, there are many different process variations that encompass these steps. Every life ...

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