The Worcester Area Cooperating Libraries is a system composed of public, academic and special libraries. In fiscal 1970-71, an expanded interlibrary loan service utilizing a daily shuttle between the participating libraries was implemented. This report describes and analyzes the interlibrary shuttle service, and presents an analysis of the statistics compiled by each of the libraries. The results of a survey designed to show the specific pattern of interlibrary lending and borrowing by each institution as well as the use of the shuttle are reported. The report recommends future changes and extensions for improvement of the service. (SJ)