This directory presents 1989 information on a 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 survey methodology and provides an overview of the research and development organizations in the region in terms of the type of organization, services, expertise, and clients. An explanation of how to use the directory and sections presenting brief descriptions and directory information on state departments of education, intermediate service agencies, and ERIC clearinghouses serving the area follow. Listings of the 94 regional educational resource organizations comprise the main section of the directory. A resume is provided for each organization which contains the following information: name, address, telephone number, and contact person; year founded; type of agency; services offered; areas of expertise; client groups; costs for services; staff size; and a brief description of the agency, its focus and workscope, activities, and services. Agencies are indexed by primary services and primary areas of expertise. A copy of the survey instrument is appended. (MES)