Test Planning is identified as one of the process areas at TMMi level 2.

At TMMi Level 3,Test Lifecycle and Integrationbuilds on the practices ofTest Planningintroduced at TMMi Level 2. This process area focuses on establishing a standardised test lifecycle, integrating the test process with the development lifecycle, and coordinating the testing effort across multiple levels. It also includes creating amaster test planthat builds upon the risk assessments, test estimates, and approaches defined at Level 2 during Test Planning.

By further refining these practices and introducing lifecycle integration,Test Lifecycle and Integrationensures that the testing processes are consistent, well-defined, and fully embedded into the overall project lifecycle​​.