A study was conducted to examine and evaluate the impact of the Cooperative Information Network (CIN) Staff Development Project (CIN-SD) in individual CIN libraries and to recommend methods for establishing on-going staff development programs in libraries. This report presents findings gathered from a survey employing questionnaires and interviews, provides an assessment through 12 conclusions, and proposes a number of specific recommendations. A large portion of the study is a staff development evaluation form, developed from the CIN staff development experience, and intended as a tool to assist library administrators and staff members in establishing on-going staff development programs in their libraries. Appendices provide the study methodology, survey findings, staff development questionnaires for libraries using and not using CIN-SD, schedules of interview questions (staff and administrator forms), and list of the systems and libraries participating in the study and the library personnel interviewed. CIN is a communications network among all types of libraries in five northern California counties intended to expand and improve information services. (Author/JD)