Final answer:
The major task of test planning is scheduling test analysis and design tasks, setting the foundation for subsequent testing activities.
Step-by-step explanation:
The question is focused on identifying a major task of test planning within the context of software testing or a similar field in technology. In test planning, a key activity is making strategic decisions about the actions that will drive the testing process. Options A, B, C, and D all represent tasks that might be part of a test plan. However, the option that stands out as a major task is Scheduling test analysis and design tasks. This is because it involves setting up the backbone of the testing strategy, including allocation of resources, determining deadlines, and detailing the key steps in the testing process. Monitoring progress and test coverage, as mentioned in option C, is also a core component of test planning but it is more of a continuous activity that takes place during the execution phase of the test plan. Measuring and analyzing results is also critical, but it is more closely associated with the later stages of the testing process after tests have been executed.