A project was conducted to establish the validity of a procedure and set of instruments to facilitate a more systematic approach for the continued staff development of inservice secondary and postsecondary vocational instructors in three states (Kentucky, Virginia, and Wisconsin) with different delivery systems. The population consisted of a volunteer sample of 453 vocational instructors, 53 immediate supervisors, and about 5,800 students. The study required that each teacher, supervisor, and pupil complete two optical scan instruments rating each teacher on (1) a Professional Needs Assessment Instrument, and (2) an Evaluation of Instruction Instrument. In order to test the validity and reliability of this procedure and of the instruments, answers were sought relating to reliability, content validity, concurrent validity, utility validity, and relative costs of the instruments. On the Needs Assessment Instrument it was found that there were no differences among the three states in terms of reliability, concurrent validity, utility validity, or relative costs. Differences existed, however, in terms of content validity; that is, the proportion of items judged to be relevant to the classroom behaviors of teachers. For the Evaluation of Instruction Instrument, similar results were found. Recommendations and cautions for implementing this staff development procedure in local school systems were made. (KC)