Discusses the accuracy of reference service in libraries as measured by evaluating answers that reference librarians give to factual questions. More than 30 reference accuracy studies are analyzed, variables explored in each study are examined, further research needs are described, and suggestions for improving service quality for reference…

Discusses issues relating to the reliability, validity, utility, and information value of unobtrusive testing of library reference services; provides suggestions for practical applications of these criteria; applies study findings to library decision making and planning; and identifies topics for further methodological refinement. (Author/CLB)