Which is not a major task of test implementation and execution?

The task of checking test logs against the exit criteria specified in test planning is not considered a major task of test implementation and execution. Instead, this activity belongs more appropriately to the test closure activities, where testers review and evaluate whether the testing objectives have been met based on the exit criteria defined during test planning.

In test implementation and execution, the focus is primarily on the actual process of conducting tests, which involves developing test cases, creating appropriate test data, documenting test procedures, and executing the tests as planned. These activities are essential for ensuring that the tests are prepared and performed correctly, providing a solid foundation for evaluating the software's quality. Logging the outcomes of test execution and recording software identities are also critical tasks that fall squarely within the implementation and execution phases, as these tasks track the results of testing efforts. Verifying that the test environment has been set up correctly is crucial to ensure that the tests run in an appropriate setting, which can impact the success of test execution.