Editing Chaos model (section)

==Software development life cycle==
The chaos model notes that the phases of the life cycle apply to all levels of projects, from the whole project to individual lines of code.

* The whole project must be defined, implemented, and integrated.
* Systems must be defined, implemented, and integrated.
* Modules must be defined, implemented, and integrated.
* Functions must be defined, implemented, and integrated.
* Lines of code are defined, implemented and integrated.

One important change in perspective is whether projects can be thought of as whole units, or must be thought of in pieces. Nobody writes tens of thousands of lines of code in one sitting. They write small pieces, one line at a time, verifying that the small pieces work. Then they build up from there. The behavior of a complex system emerges from the combined behavior of the smaller building blocks.