The five essential features of any good library plan are objectives, inputs, process, outputs, and evaluation. In developing countries, the following factors affect, and should be considered, in the formulation of library plans: illiteracy, lack of educational facilities, no common language, insufficient funds, and geographical features and the population distribution. The library services of Tanganyika are discussed, with these features and factors in mind, under the following headings: urban, rural and postal library service; box (collections of books) exchange; school libraries; special library development; Library Services Board Committees (including staff and training, and committees for public, school, special and branch libraries); the Development Programme; cooperation and coordination; manpower planning; recruitment and training of librarians and library assistants; and, the problems of book production. (Other documents on libraries in Tanganyika are available as: ED053749, ED054829 and ED054831.) (SJ)