The research methods text for library and information science by Busha and Harter (1980) provided a bibliographic reference to Crowley and Childers, but no discussion of their work or its importance. Hamburg et al. (1974) described briefly their research, but did not build it into their own model library program. The Davis and Rush (1979) guide to information storage and retrieval systems did not mention them. Other similar monographs, even the more theoretical ones such as Kochen's (1974) Principles of Infonnation Retrieval, have not mentioned them either. Lancaster's (1977) description of their work is still the most detailed treatment in a textbook, calling their work an unobtrusive evaluation the most important to date.