The Library Aides Program, an Elementary and Secondary Education Act project, was begun in 1966 in the Pittsburgh public and parochial schools to provide a trained aide to assist the librarian with general and paraprofessional duties. An evaluation of the public school program was conducted (1) to determine how librarians and library aides divide their time among various duties performed in the library, (2) to determine whether librarians who are assigned library aides devote more of their time to professional duties, and (3) to assess the librarians' attitudes toward the program. Using the questionnaire method and a control group of eight schools not in the program, the evaluation indicated that librarians divide their time approximately equally between professional and nonprofessional duties, irrespective of the presence or absence of aides. The Library Aides Program was considered successful by all who were involved in it, and no criticism of the program was offered except that the program should be extended to provide for a full-time aide. Appendixes include the evaluation questionnaires and tables displaying the allocation of librarian time. (JB)