GP 4.2 Stabilize Subprocess Performance
The purpose of this generic practice is to stabilize the performance of
one or more sub-processes of the defined (capability level 3) process
that are critical contributors to the overall performance using
appropriate statistical and other quantitative techniques. Stabilizing
selected sub-processes of the process supports predicting the ability of
the process to achieve the established quantitative quality and process performance
objectives.
A stable sub-process shows no significant indication of special causes of
process variation. Stable sub-processes are predictable within the limits
established by the natural bounds of the sub-process. Variations in the
stable sub-process are due to a constant system of chance causes, and
the magnitude of the variations may be small or large.
Predicting the ability of the process to achieve the established
quantitative objectives requires a quantitative understanding of the
contributions of the sub-processes that are critical to achieving these
objectives and establishing and managing against interim quantitative
objectives over time.
Selected process and product measures are incorporated into the
measurement repository to support process performance
analysis and future fact-based decision making.
- Statistically manage the performance of one or more sub-processes
that are critical contributors to the overall performance of the
process.
- Predict the ability of the process to achieve its established
quantitative objectives considering the performance of the
statistically managed sub-processes.
- Incorporate selected process performance measurements into the
process performance baselines.