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Description: Introduction : purpose and objectives of this book -- Creation, diffusion, and utilization of knowledge -- The role of professionals as change agents -- The science supporting the information professions -- Information transfer in the information professions -- The cycle of professional service -- The information infrastructure -- The processes and functions of information professionals -- The infrastructure of the information professions -- Trends and issues. "This introduction to the functions of information professionals is approached through models of communication theory. Professionals have the role of diagnosing the information needs of clients using information transfer theory. Current trends and issues are discussed as they focus on the role of a professional and the services offered."--BOOK JACKET.