Although teacher-developed materials are usually created with objectives designed for a particular group of students at a particular point in time, they may be valuable for use by other instructors, at other institutions, in other circumstances. Materials which are immediately transferable to other situations should be called "usable." Materials which do not fit all of these criteria, but which are capable of adaptation to other circumstances should be called "useful." A teacher-developed resource that is ready for convenient use is packaged in such a way as to specify student-centered objectives, student-benefit evaluation criteria, and student-paced resources. Material can be defined as "usable" or "useful" on the basis of teacher evaluation, computer evaluation, or a pre-test/post-test method. Once the quality of a resource is identified, it should be compared with other resources and rankings should be made. (Author/DC)