Whereas some models for test process improvement focus mainly on higher test levels, e.g., Test Process Improvement (TPI) [Koomen and Pol] and its successor TPI-Next [Sogeti], or address only one aspect of structured testing e.g., the test organization, the TMMi addresses all test levels (including static testing) and aspects of structured testing. With respect to dynamic testing, both lower test level (e.g., component test, integration test) and higher test levels (e.g., system test, acceptance test) are within the scope of the TMMi. Studying the model more in detail one will learn that the model addresses all four cornerstones for structured testing (lifecycle, techniques, infrastructure and organization) [TMap].