Enhancing the quality of service is an ongoing concern for academic and research libraries. In order to grow and develop as an organization, it is necessary to assess services and mission on a regular basis. Output measures provide objective data on the scope and effectiveness of library services. These output measures can also be used to evaluate the library's services, to demonstrate the library's value, and to guide resource allocation decisions (Van House 1990). An evaluation of services was recently done by the Martin P. Catherwood Library, Cornell University (Catherwood Library). This report provides an overview of this assessment.