This paper attempts to analyze the problem of congestion, using a mathematical model shown to be of value in other similar applications. Three criteria of congestion are considered, and it is found that the conclusion one can draw is sensitive to which of these criteria is paramount. (8 references) (Author/NH)

Presents and discusses the results of two studies undertaken at the University of California at Berkeley to determine the relative ease of using computer output microform (COM) library catalogs in rollfilm or fiche format for library users and library personnel. Two data tables and 11 references are included. (JL)

Research conducted at Fisher Library, University of Sydney, which measured user failure to locate known items in catalog or on shelves, yielded overall failure rate of 35.9 percent (26.2 percent at catalog; 46.1 percent at shelf). User errors caused two-thirds of failures at catalog and more than half at shelf. Fifteen references are provided.…