Three methods of sequencing coordinate concepts (simultaneous, collective, and successive) were investigated with a Bayesian, computer-based, adaptive control system. The data analysis showed that when coordinate concepts are taught simultaneously (contextually similar concepts presented at the same time), student performance is superior to either a collective (clustering the concepts in subgroups) or successive (concepts presented separately) sequence. Although time on-task was not different between the groups, an effectiveness ratio (posttest score minus pretest score divided by time on-task) showed that the simultaneous sequence was more effective in terms of student learning and economy of time that the other two sequences. (Author)