The objective of this paper is to understand users' preferences regarding internet service in public library. For this purpose, we employed adaptive conjoint analysis (ACA) and conducted computer based interviews with 470 visitors to Ibaraki Prefectural Library. As conjoint attributes, seven items were noted: site restriction, assistance given by library staff, time restrictions, waiting time, privacy, use in combination with printed matter, and application necessity. The results show that ability in using the internet and the purpose of the visit lead to different results in the average importance of "staff assistance" and "site restrictions", while "privacy" was commonly regarded as a principal attribute. Based on these users' preferences, we discussed preferable location and environment for computers of the internet service in a public library. It is suggested that the targeted segment should be clarified to account for distinct preferences of various users.
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