Finally, in public administration there is a special test of theory—how useful is it? Because of this test, the degree of measuring rigor and precision and the level of elaboration in a theory may be less important than the question of usefulness. Good or useful theory presumes to organize and classify data in such a way as to screen facts and then focus on only the most important. The test of a theory’s usefulness is often its criteria in selecting and classifying facts, and if these are accurate, the theory will enhance understanding, guide research, and powerfully describe, explain, and predict.