Selecting standard time-sharing terminals

Selecting terminals for timesharing users is a service provided by many computer centers, either as a one-tlme activity when time-sharing systems are first installed or in some cases on a continuing basis. We may say that "standard" terminals are selected whenever users are advised or required to select units from a predetermined list of models. For thls paper, I am making four important assumptions about the process of selecting standard timesharing computer terminals: