Sub-practices are informative components within the TMMi model. Informative components provide additional details or guidance to help organisations understand how to approach the required and expected components. Sub-practices are not mandatory, but they offer ideas or methods that can assist with the implementation of specific practices. Other examples of informative components include example work products, notes, and references.
Reference:
"Sub-practices are a detailed description that provides guidance for interpreting and implementing a specific practice. Sub-practices are informative components".

The statement that Specific Goal 1 of the Test Measurement (4.1) process area covers the communication of test measurement results after analysis is FALSE. Specific Goal 1 focuses on aligning test measurement and analysis activities, which involves setting measurement objectives, specifying the measures to be taken, and establishing procedures for data collection, storage, and analysis. However, the communication of results comes under Specific Goal 2, which deals with the analysis and reporting of test measurement results.
TMMi Reference:
Test Measurement at TMMi Level 4 includes defining measures, data collection, and storage as part of aligning test measurement and analysis activities, while communicating results is part of a different goal.

A test policy is a high-level document that outlines the objectives, goals, and strategic views regarding testing. It serves to align testing activities with the organisation's business objectives and quality goals. One of the critical elements in a test policy is defining the quality levels to be achieved, which ensures that testing aligns with the expectations for product quality, both functional and non-functional. Other aspects, such as risk categories, test types, and regression testing approaches, are typically defined in more detailed test strategies or plans, not in the high-level policy.
Reference:
"A test policy is necessary to define the organization's overall test objectives and quality levels" .

Test Design and Execution is a key process area at TMMi Level 2, not Level 3. However, other process areas at TMMi Level 3 include Non-functional Testing, Peer Reviews, and Test Lifecycle and Integration. Test Design and Execution plays a foundational role in laying down the practices for creating and executing test cases, especially at earlier maturity levels. By TMMi Level 3, processes become more sophisticated with a broader range of testing techniques and integration into the overall lifecycle.
Reference:
"TMMi level 3 includes process areas such as Non-functional Testing, Test Lifecycle and Integration, and Peer Reviews".

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.