What is the most useful metric to monitor during test execution?

Monitoring the percentage of executed test cases during test execution is particularly useful because it provides a clear indicator of progress towards completion. This metric helps in assessing how much of the planned testing has been carried out, which is crucial for understanding the current state of the testing process.

By tracking this percentage, stakeholders can identify areas where testing might be lagging, enabling timely interventions and resource reallocations if needed. Additionally, knowing how many test cases have been executed compared to how many were planned allows the team to estimate when testing will be completed, ensuring that project timelines are adhered to.

The other metrics, while valuable in their own contexts, do not directly indicate the progress of test execution as effectively as the percentage of executed test cases. Average time taken for test execution provides insights into efficiency but does not reflect completion status. The number of testers involved gives an idea about resources but does not map directly to progress. The percentage of requirements covered speaks to the depth of testing in relation to requirements rather than the breadth of the test cases executed, which is critical during the execution phase.