A study was conducted to inventory and describe the quantitative performance measures of an academic library system which originate as a result of the activities at an automated loan desk. Visits were made to 24 academic libraries whose experience in library automation ranged from the completely on-line system with user self service and in-house computer to the wholly batch oriented system. It was concluded that with the exception of a few outstanding examples, there is little sophistication in the collection, manipulation, or use of the statistical management data now being produced by computer automated circulation systems for the support of library planning/operational functions. Libraries need to exploit the work already done on quantitative performance measures in both business and higher education. (Author/PF)