To know if your software testing is well-defined, you can consider the following

Test coverage: Your test cases should cover all aspects of the software and its features.

Test design: The test design should be clear, systematic, and based on a thorough understanding of the software requirements and specifications

Test data: Appropriate and relevant test data should be selected to ensure that all test cases are executed effectively.

Test objectives: The objectives of each test should be clear, measurable, and aligned with the software requirements and specifications.

Test environment: The test environment should be appropriate and well-defined, with all necessary tools and resources in place.

Test documentation: The test documentation should be complete, up-to-date, and easily accessible to all relevant stakeholders.

Test processes: The testing processes should be well-defined, consistent, and repeatable.

In conclusion, to ensure that your software testing is well-defined, you should consider factors such as test coverage, test design, test cases, test data, test objectives, test environment, test documentation, and test processes. The Quality Matrix Group is an important component in this process as it helps to define, measure, and monitor the quality of the software being tested. By incorporating the principles of the Quality Matrix Group into your software testing process, you can ensure that your tests are comprehensive, consistent, and aligned with your overall quality goals.