How would you make a judgment regarding the utility of a published test?

How would you make a judgment regarding the utility of a published test? What factors would you consider? What resources would you use?
What factors concerning test utility would you consider as you work through the process of test construction?
What are factors that need to be considered early in test construction to ensure that the process proceeds accurately and you end up with a useful test?
Consider that you are constructing a test for test anxiety. What would you include in an assessment of an individual’s level of test anxiety? How would you determine which items should be included in the assessment? How would you evaluate the appropriateness of your items and each item’s performance in the assessment?