Argues that individual and group differences in priming performance scores are heavily influenced by overall speed and accuracy, and thus are a flawed reflection of internal activation of semantic priming. Suggests that meaningful comparison of groups on the activation underlying priming difference scores requires removing the effects of overall…

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)