A survey was administered to users of the New York State Library's microfiche catalog to determine their success and satisfaction in using the catalog and to examine characteristics of successful and satisfied microfiche catalog users. Usable questionnaires were obtained from 280 catalog users. Responses to selected items were weighted and summed to produce a score for each respondent on five variables: (1) catalog usage, (2) library staff assistance, (3) satisfaction with and success in using microfiche readers, (4) success in finding entries, and (5) overall microfiche catalog satisfaction. Personal data were also gathered to assign respondents to appropriate age, sex, education, and occupation groups. Data analysis involved: tabulating responses by item for all groups combined; summarizing comments and suggestions separately for librarians, nonprofessional library workers, and patrons; evaluating by analysis of variance the differences among the various groups on the five variables mentioned above; and computing Pearson correlation coefficients to determine the relationships among the five variables. Findings indicated significant differences among the subgroups in catalog usage and in reader usage, except for male and female respondents, and no significant difference among the subgroups in finding entries. Five appendices, five tables, and 24 references are provided. (RBF)