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The correct order of TMMi maturity levels from low to high is:

Managed (Level 2): Testing becomes a managed and separate process from debugging, with formal strategies and plans.

Defined (Level 3): Testing is fully integrated into the development lifecycle, with standardized processes across projects.

Measured (Level 4): Testing processes are measured quantitatively, and product quality is evaluated with formal metrics.

This sequence reflects the increasing maturity and sophistication of an organization's testing processes as they progress through the levels.

TMMi References:

The TMMi maturity levels follow the order of Managed (Level 2), Defined (Level 3), and Measured (Level 4)​​.

During the Diagnosing phase of a test improvement cycle, in addition to conducting an assessment to determine the current maturity status, the activity of developing recommendations is also performed. These recommendations provide guidance on what actions should be taken to achieve the desired improvements. The assessment helps establish the organisation's current state, and the recommendations serve as a roadmap for moving forward.

At TMMi Level 5, the Quality Control process area becomes relevant as it focuses on statistically managing and controlling the test process. Since the organisation is already at TMMi Level 4, moving to Level 5 involves ensuring that the test process is fully predictable, measured, and statistically controlled. Quality Control is a key process area in achieving TMMi Level 5 compliance, alongside other areas such as Defect Prevention and Test Process Optimization.

Agile organisations often focus on rapid iterations and minimal documentation, which can lead to the omission or underuse of structured testing practices. TMMi serves as a valuable guide for Agile teams by highlighting critical testing practices that might be overlooked, ensuring that essential quality processes such as risk analysis, peer reviews, and test planning are not neglected​​​.

This reminder ensures that teams maintain a disciplined approach to testing while still benefiting from Agile flexibility.