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However, because this chapter
consists of summaries of the process areas, anyone wishing to get a better idea of
the model, no matter which representation is to be used, can benefit from this
chapter. Once again, we are not attempting to teach the CMMI. We simply offer a
condensed version of the various areas and key points to consider.
Mo ing from le el 3 to le el 4
Level 4 is all about numbers. The projects are managed ???by the numbers.??? Organizational
decisions are made ???by the numbers.??? Processes, services, product quality
are all measured ???by the numbers.??? At Level 4, the organization has achieved all
of the goals of Levels 2 and 3. Processes, although qualitatively stable and predictable
at Level 3, can be proved to be quantitatively stable and predictable at Level
4. The major difference between Level 4 and the next level, Level 5, is that Level 4
analyzes the data collected, determines special causes of variation from the norm,
and supports quantitative management and control. You do this to make your processes
predictable.


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