COMPUTERS OFFER TEACHERS innumerable methods of enhancing successful instruction. However, there are so many different programs, networks and computer-based lesson plans, educators often struggle to decide which programs may be appropriate for a given subject or class. Questions of practicality, cost and simplicity must also be considered. To get a better understanding of how computers may be used in the classroom, take a look at some of the systems and services educators have used to help their students learn and understand. These examples cover a range of methods, uses and levels of sophistication, from complex, yet costly multimedia systems to simple word processing and email-driven lessons. Following each case are important issues for discussion.