The explicit goal of most educational information or resource centers, is to assist clients in obtaining and utilizing information to improve educational practice and aid in educational decision making. As the number of services has increased, the need to systematically assess them has become critical. Previous efforts have been limited and relatively simplistic. The Client Assessment Package (CAP) was designed to expand upon previous evaluation research by using a nationwide data base to delineate the significant interrelationships among the complex sets of variables which influence information utilization. Information utilization is defined as a stochastic process involving generalized and specific psychological states of the potential user, the organizational context in which the user is embedded, and the characteristics of the information and services provided. This paper described the Client Assessment Package, proposed data collection procedures, and proposed analyses of a nationwide client data base. A conceptual framework, developed to examine the interrelationships among the variables identified as contributing to information utilization, was composed of seven domains: (1) individual client characteristics; (2) institutional characteristics; (3) linker characteristics; (4) request characteristics; (5) process characteristics; (6) client satisfaction; and (7) service utliization. These variables are described as the basis for item generation for the five instruments which compose the CAP. (Author/JAC)