Level 5 Optimization
On the basis of all results that have been achieved by fulfilling all the improvement goals of the previous maturity
levels, testing is now a completely defined process and one is capable of controlling the costs and the testing
effectiveness. At TMMi maturity level 5, an organization continually improves it processes based on a quantitative
understanding of the common cause of variation inherent in processes. Improving test process performance is
carried out through incremental and innovative process and technological improvements. The methods and
techniques are optimized and there is a continuous focus on fine-tuning and test process improvement. Defect
prevention and quality control are practiced. Statistical sampling, measurements of confidence levels,
trustworthiness, and reliability drive the test process. Amongst others “Defect Prevention” and “Quality Control” are
introduced as process areas. The test process is characterized by sampling based quality measurements. A
detailed procedure exists for selecting and evaluating test tools. Tools support the test process as much as
possible during test design, test execution, regression testing, test case management, etc. Process re-use is also
practiced at level 5 supported by a process asset library. Testing is a process with the objective to prevent defects.
Process areas at level 5 are:
5.1 Defect Prevention
5.2 Test Process Optimization
5.3 Quality Control