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 ...

Get Software Development and Professional Practice now with the O’Reilly learning platform.

O’Reilly members experience books, live events, courses curated by job role, and more from O’Reilly and nearly 200 top publishers.