The pursuit of continuous improvement is the most essential attribute of the highest process capability level (Level 5). A process capability level is a measure of how well a process or activity is performed in terms of effectiveness, efficiency, completeness, reliability, etc. A process capability level can range from 0 (incomplete) to 5 (optimizing). Level 5 (optimizing) means that the process continuously improves its performance through both incremental and innovative improvements. The pursuit of continuous improvement is the most essential attribute of Level 5, as it implies that the process is constantly monitored, evaluated, learned from, and enhanced.14 References: CMMI for Development, Version 1.3, CMMI Institute - Capability Maturity Model Integration