This study suggests that it is important to study library users' reaction to and satisfaction with the instruction given to them for use of the online public access catalog (OPAC). The objective of this study was to discover the types of instruction that users at the Beavercreek Community Library (Ohio) feel are most useful in learning the OPAC. Survey methodology was employed that included questions on OPAC use; methods of instruction used to learn the OPAC; opinions about the helpfulness of the different types of instruction; what was seen as the best type of instruction; and level of satisfaction with instruction provided. It was found that most of the respondents learned from on-screen instruction, followed in percentage by printed instruction, trial and error, staff instruction, and help from other users; and also that first time users rated staff instruction more highly than frequent users. The questionnaire used in the study is included in the appendix. (Contains 21 references.) (JLB)