CMMI Maturity Level(ML) is a systematic and structured framework for staged representation. There are three CMMI models already published, CMMI-ACQ, CMMI-SVC, and CMMI-DEV. Newest CMMI-DEV version(V1.2) has totally 18 Process Areas(PA) for ML2 and ML3, and has 2 PAs, Organizational Process Performance(OPP) and Quantitative Project Management(QPM), for ML4. OPP is to establish and maintain a quantitative understanding of the performance of the organization's set of standard processes. And QPM is to quantitatively manage the project's defined process to achieve the project's established quality and process-performance objectives. In this report, we will present our practical experiences in implementing process improvement activities from ML2 to ML4 and propose our lessons learned from this initial CMMI high-maturity journey.
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