This directory presents information on the 1994 census of educational research and development and service improvement organizations in the Mid-Atlantic region (Delaware, the District of Columbia, Maryland, New Jersey, and Pennsylvania). The introduction describes the survey methodology and provides an overview of the research and development organizations in the region in terms of the type of organization, services, expertise, clients, size, and costs. An explanation of how to use the directory and sections presenting descriptions and directory information on state departments of education, intermediate service agencies, and ERIC Clearinghouses serving the area follow. Listings of the 97 regional educational resource organizations in alphabetical order comprise the main section of the directory. For each organization, the following information is provided: name, address, telephone number, and contact person; type of agency; staff size; services offered; areas of expertise; costs for services; client groups; and a brief description of the agency. The agencies are indexed by primary services offered and primary areas of expertise. The survey instrument and a list of resource directories consulted are appended. (JLB)