This report describes the New York City School Library System (NYCSLS), a pilot project aimed at developing a network of cooperating school libraries to participate in the sharing of print and media resources, cooperative collection development, and other services. This report reviews the assessment of the project's effectiveness in the establishment of a data base, the development of collections and staff, and the utilization of the interlibrary loan system. Although the lack of clerical support was cited as a major problem, it was reported that the project represented an important step in the more efficient utilization of available resources. (JCD)