ABSTRACT
In order to estimate the variables in equation 2.7, the financial cost to the library and the opportunity cost of time to interlibrary loan patrons must be measured. Financial data on the costs of inter-library loan at three of the four libraries was used to determine the library costs for different methods of interlibrary loan service. The form used for the ARL/RLG 1993 report on the costs of interlibrary loan was updated for the three participating libraries. 1 In addition, interlibrary loan staff members were timed to determine the actual costs of individual parts of the borrowing and lending transactions.
