Definition :
The Capability Maturity Model (CMM) is a development model created once a study of knowledge collected from organizations that contractile with the U.S. Department of Defense, who funded the analysis. The term “maturity” relates to the degree of ritual and improvement of processes, from ad hoc practices, to formally outlined steps, to managed result metrics, to active improvement of the processes.
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Further Reading:
Lean Agile Software Development by Alan Salloway, Guy Beaver and James R. Trott.