Which activity involves selecting or generating data for testing purposes?

The activity that involves selecting or generating data for testing purposes is test data preparation. This step is crucial in the testing process as it ensures that the right data is available and appropriate for the tests to be performed. Having accurate and relevant test data is essential for evaluating the functionality, performance, and reliability of the software.

In test data preparation, testers identify the types of data needed based on the test cases and design criteria. This may involve creating new data that mimics user interactions, duplicating existing data, or anonymizing sensitive information to ensure compliance with data protection regulations. The quality of the test data directly impacts the effectiveness of the tests and the validity of their outcomes.

Test design refers to creating the test cases and determining how to test specific requirements. It is focused on the structure and framework of testing rather than sourcing or preparing the actual data needed.

Test execution is the phase where the test cases are run using the prepared test data to validate the software's functionality and performance. While this is a critical part of the testing lifecycle, it does not involve the preparation stage itself.

Test charter pertains to a specific aspect of exploratory testing where a tester outlines the scope, objectives, and approach for their exploratory test session. It does not involve data selection or generation