This report on the third phase of a two-year study of human services information clearinghouses discusses clearinghouses in terms of their role in information dissemination and diffusion, planning considerations, operational cost recovery, overlap and duplication in services, and evaluation techniques and measures. Information was gathered from literature searches, interviews, data collected in Phase II, and group meetings attended by contractors and federal officials who monitor or operate clearinghouses. Findings indicate the need for: (1) the assignment of a group or an individual to be responsible for establishing DHHS policies or long-term actions to manage and coordinate information services; (2) the determination of government's role in providing information to define government information policy; (3) a clearer definition of the missions of each clearinghouse; (4) a reconciliation of fixed funding support for clearinghouses; (5) development of policies and guidelines for cost accounting practices; (6) establishment of a cost recovery policy; and (7) assessment of the clearinghouse performance. Recommendations are provided as well as appendices containing survey questionnaires. Listed are 10 tables and 62 sources. (RBF)