The history, purpose, and operation of six computer-based information networks are described in general and nontechnical terms. In the introduction the many definitions of an information network are explored. Ohio College Library Center's network (OCLC) is the first example. OCLC began in 1963, and since early 1973 has been extending its services outside of Ohio. MEDLINE and the SUNY Biomedical Communications Networks are two examples developed along general subject specialty lines. MEDLINE is a national development, while the SUNY network is regional. Educational Resources Information Center (ERIC) differs from the other examples in that it does not have a fully developed system of high speed electronic communications with on-line remote terminals. In addition, ERIC is a diffuse, field-based network with local clearinghouses collecting material in various fields. EDUCOM and APRA are the final two examples, ones with objectives not completely realized. (WH)