Relationship to the CMM Framework
The CMM has a level 4 capability known as Quantitative Process Management. The CMMI has a KPA also, known as Quantitative Project Management, but with more detail about the expected use of statistics to manage the process. The purpose of these practices is self-explanatory, that is, to use quantitative methods for managing the processes used by the team. The practice in the CMMI uses terms such as statistically managed and special causes, which seems to imply statistical process control (SPC), as defined by Shewhart and as described extensively by Deming.[1] SPC is used for prediction and has no signs of special cause variations. Such a process is said to be in statistical control.
[1] W. Edwards Deming (1982). ...
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