This guide discusses four types of microcomputer-based communication programs that could prove useful to evaluators: (1) the direct communication of information generated by one computer to another computer; (2) using the microcomputer as a terminal to a mainframe computer to input, direct the analysis of, and/or output data using a statistical analysis program; (3) searching large databases maintained on a mainframe computer; and (4) using a microcomputer to send and receive personal messages. The key characteristics of telecommunications are discussed and 11 important telecommunications terms are defined. Additional topics addressed include: software typically used for telecommunications; the hardware required, i.e., a modem and interface; primary characteristics to look for in a modem; choosing the right telecommunication system; key characteristics of networking; considerations regarding multi-users systems; and basic system costs. It is noted that a multi-user system includes these five components: the hardware; the interface; the master controller (either a chip on the expansion card, a hard disc drive, or a dedicated computer); the system server; and the wiring to connect the system parts. Evaluators are cautioned that, while multi-user and networking systems are very appealing, at the present time they are not realistic because of copy protection procedures used by most software companies and the cost of multi-user versions of software. A list of references is provided. (JB)