Examines Blumenschein's "Description of Various Libraries in Europe" as an early example of library research methodology; discusses his methods of data collection; describes his use of a questionnaire; and suggests the necessity of further studies of the development of research in library and information science. (Contains 10…

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)