Computer-based training, already well established as a means to improve primary training while reducing its overall cost, may be made significantly more cost effective by training students in small groups of two to four at a terminal rather than one per terminal. In studies performed at Fort Knox's Training Technology Field Activity, grouping led to better retention, better training of low ability students, decreased times for completion of training, and reduced instructor/proctor intervention, without any reduction in achievement. Grouping can relieve scheduling difficulties when terminals are limited. Grouping can help instructors deal with high ability students, who help their peers instead of finishing early and making further demands on the instructors. These studies involved the learning of procedures common to military training, for both acquisition and sustainment training. Special preparation of materials or student assignments is not required. Therefore, grouping can be applied immediately to existing training systems.