Whether you are creating a new test or trying to identify the best existing test

Whether you are creating a new test or trying to identify the best existing test to use in a testing situation, you must consider whether the test can produce valid measurements and is appropriate for the testing situation. In this discussion, you will explore the importance of validity. Be sure to address the following in your post:
What does validity mean?
Why can a test not be “universally valid” across testing situations?
Discuss three examples of how a test developer could gather evidence of construct validity for a new test.