The complexity of the features in the basic object-oriented (OO) structure, the class, has resulted in a plethora of implementation-based testing techniques (IBTTs) to adequately test these features. In this paper we use our taxonomy of OO classes to automatically catalog each class in an OO program thereby reducing the analysis time required by the tester when selecting IBTTs. We present a study that shows the number of entities to be analyzed by a tester when selecting IBTTs can be reduced by 53% if the class under test (CUT) is first cataloged using our taxonomy of OO classes.