This booklet describes online searching using Materials Information, a metallurgy and metals science information service of the Institute of Metals in London and ASM International in Cleveland, Ohio, which is available through the major online vendors. Described in detail are online searching, online databases, costs, online hosts or vendors, telecommunications and equipment needed, procedures for getting online, search strategies, and where to go for help. An insert sheet provides the headquarters addresses of online hosts or vendors in both the United States and Europe. (EW)