This codebook describes the data file used in a study which gathered data on 80 presearch interviews in seven medical libraries. The study was conducted (1) to identify verbal and nonverbal behaviors that facilitate, maintain, or impede information exchange in interviews between search intermediaries and library users requesting online bibliographic searches; (2) to identify tasks that are accomplished by the librarian to facilitate information exchange; and (3) to objectively code videotaped presearch interviews in terms of the extent to which those tasks were accomplished. Codes and frequency distributions are displayed for seven types of data: general information from the interview log form, special conditions, requester information, requester satisfaction measures, librarian satisfaction measures, task analysis, and librarian information. The data file described is stored in a Sharp/APL workspace on Syracuse University's IBM 370. (FM)