Although standardized tests are easily compared across schools, districts, and states, the data they yield isn't very significant for individual classrooms. By focusing on evaluating general skills and knowledge, these tests overlook specific learning as well as other important qualities of student works such as creativity and individuality. The tests should not be used to evaluate the quality of classroom instruction, since test scores can be influenced by a number of variables not related to actual student ability (e.g. socioeconomic status, curriculum exposure, or inherent academic aptitude) (Tucker & Stronge, 2005).