Which one of the following is not a key process area in CMM level $5$ ?
Answer : Software product engineering
Reference : CMMI Key Process Areas
CMM Level 5 is called "Optimized". The software process is at CMM Level 5, if there is continuous process improvement, if there is quantitative feedback from the process, and from piloting innovative ideas and technologies. Software processes are at CMM Level 5, if there are process change management, defect prevention and technology change management.