Quantitative objectives for quality and process performance are established and used as criteria in managing processes. Quantitative objectives are based on the needs of the customer, end users, organization, and process implementers. Quality and process performance are understood in statistical terms and are managed throughout the life of the processes.
For these processes, detailed measures of process performance are collected and statistically analyzed. Special causes of process variation are identified and, where appropriate, the sources of special causes are corrected to prevent future occurrences.
Quality and process performance measures are incorporated into the organization’s measurement repository to support fact-based decision making in the future.
A critical distinction between maturity level 3 and maturity level 4 is the predictability of process performance. At maturity level 4, the performance of processes is controlled using statistical and other quantitative techniques, and is quantitatively predictable. At maturity level 3, processes are only qualitatively predictable.
CMMI, ISO 900x and Six Sigma meet at level 4. This presentation, made to a process improvement group in 2003, describes the inter-relationships. Organizational Capability and Maturity as expressed in the CMMI can be correlated (mapped) with many Process and Quality Improvement methods Statistical Quality Control is described succinctly with reference links in a Wikipedia article.
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Last modified: Jan-09