The Purdue University Libraries' fee-based service, the Technical Information Service (TIS), has conducted three customer satisfaction surveys over the past ten years. The first one, in 1990, was a very simple survey designed to elicit a few facts and comments (see Appen- dix 1). The second two, conducted professionally by business school graduate assistants in 1992 and 1997, were much more sophisticated in their design, implementation, and analysis (see Appendix 2).