Following a review of research endeavors in the area of teacher evaluation and performance assessment, some procedures which have been developed at the University of Toledo (Ohio) to discriminate between competent and incompetent teachers are described. The university's program is competency-based, and researchers have identified 49 competencies student teachers are expected to demonstrate. Two instruments have been used in conducting research on these competencies. The low-inference instrument used is the Classroom Observations Keyed for Effectiveness Research (COKER); the high-inference instrument is the Teacher Performance Assessment Instrument (TPAI). The scoring procedures used with these instruments differ considerably, but the general results produced provide indications of how individuals, as well as groups, score on each competency measured. Results obtained from the instruments are usually provided in profiles of scores which can be generated for groups or individuals. The University of Toledo, through its project staff and faculty, has the capability of providing services to other institutions interested in the measurement of teacher performance. (JD)