This two-part publication reports on a study of consumer information delivery by library and non-library networks, which involved an extensive literature review, a telephone survey of 620 library networks, the development of an assessment model for the effectiveness of network information delivery, the development of an in-depth guide for interviewing networks, and case analyses of five library and four non-library networks providing consumer information services. The first part contains: (1) a discussion and bibliography of the literature on library and non-library consumer information networks; (2) a draft assessment model containing research questions in 13 areas; (3) descriptions of the library network survey and the selection of nine networks for in-depth interviewing; (4) the similarities and dissimilarities among the nine networks interviewed; (5) a reexamination of the assessment model in light of interview findings; and (6) study conclusions. The interview guide and network survey questionnaire are appended. The nine case studies presented in the second part analyze the consumer information services provided by Masssachusetts' Community Health Information Network (CHIN), Free Library of Philadelphia, Nassau Library System, OCLC's Channel 2000, Denver's Regional Energy/Environment Information Center, Better Business Bureau of Western Massachusetts, Consumer Education Resource Network (CERN), Massachusetts Executive Office of Consumer Affairs, and Middlesex County Extension Service. (ESR)