This report relates principles of system analysis and work study techniques to library activities in order to aid librarians in their assessment of library work. The meaning and methods of system analysis and work study are explored and the system concepts of organization purpose, work goals and performance objectives are defined and applied to libraries. The subdivision of work into components suitable for measurement and procedures for collecting work performance data are explained. The use of work-study techniques is demonstrated in an examination of two types of school library activity: instructional support of education programs and information services to school personnel. Task sequences for these activities are presented with forms and procedural suggestions for recording performance data and cumulating statistics on them. (Author/JG)