Diagnostic or Achievement Testing - which is more important?
In short, it depends on why the test is being used. Diagnostic tests can be used to measure how much a test-taker already knows about a specific content area, and to identify areas which may need further improvement. These tests can be used specifically on known areas of difficulty, and often the total score on these tests are less important than being able to identify which questions in the test were difficult, and whether there are commonalities in incorrect questions. Ther
