To evaluate the effectiveness and extent of use of a vocational curriculum development guide prepared by the institute's participants, questionnaires and interview data were obtained and analyzed in 1969 from four sources: (1) the original participants (19 vocational educators), (2) their supervisors, (3) 35 State Directors of Vocational Education, and (4) a control group of 33 nonparticipants . Data analysis confirmed that institute participants were generally more effective as change agents than nonparticipants holding comparable positions in vocational education. The guide was used in secondary curriculum planning as well as in instructing others on the participants' staffs. Participants used the institute-prepared guide much more than nonparticipants used self-developed or other available guides. Also, with respect to curriculum development, participants were more effective than the control group in reaching State vocational associations, teacher training units at the university level, inservice teacher training projects, staff training programs, administrators, and research coordinating units. (JK)