Nationwide dissemination of the Iowa Chautauqua Model for inservice professional development of K-12 science teachers has led to new professional development programs in many states. Discusses a formative evaluation of the implementation of the Collier Chautauqua Program (CCP) which focuses on teacher enhancement resulting from participation in the program, teacher concerns regarding classroom implementation of instructional innovations, and issues related to district-wide implementation of the program. (Author/MM)