The primary objectives of this project were: (1) to identify population groups with information needs that differ from the needs of the general population, and to define these needs and (2) to formulate tentative specifications for post-1975 library services. Background work for these major objectives involved searching and reviewing the literature concerned with user studies and specifications for future library services. Consideration was also given to those planning methodologies that would be applicable to the development of future library and information services. This study concentrated on the special needs of identifiable subgroups in the population rather than on the needs of typical users who constitute the bulk of the public library clientele. All of these subgroups were identified and studied in terms of single variables, such as age, economic level, or housing location and were found to have information needs somewhat different from the needs of the general population. No effort was made to identify any subgroups in terms of multi-variable descriptions, such as the term "disadvantaged" might imply. This type of multi-variable analysis would be a very useful follow-up study. (Author/NH)