A computer-based attention reduction model of training is presented, and associated issues related to instructional systems design are outlined. Attention reduction training (ART) is based on the dual task assessment procedure developed by researchers in the area of memory. The technique involves having subjects respond to two tasks simultaneously. The issue of vertical transfer of training is central to the model. Vertical transfer describes a condition in which a subordinate skill is used when performing a superordinate skill; the notion that two or more skills may be related in a hierarchical fashion becomes paramount to this view of transfer. Whereas training aimed at skill mastery focuses primarily on performance accuracy, ART extends skill performance criteria to include speed (reaction time) and other measures related to the reduction of attentional resources (i.e., the ability to process two or more tasks concurrently). From this perspective, it is maintained that the development of fluent or automatic intellectual skills is content specific and should be approached from the perspective of detailed hierarchical analysis techniques. The consistent mapping practice procedure can be used to reduce attentional resources related to the secondary skill/task and to test the hypothesis that this ART facilitates vertical transfer. Issues related to instructional development include motivation, incrementing task workload, use of multiple primacy tasks, optimal primary task workload, and speeded training techniques. Two figures are included. (TJH)