Research has been conducted on learning and memory since the late 1800s. Recently, there is increasing documentation on various instructional strategies in authentic classroom settings. The instructional approaches an instructor chooses is a function of the instructor (eg, comfort, experience), the students, the criterial tasks the students need to accomplish, and the content. Selecting the most appropriate intervention is complicated by costs associated with the instructional intervention. However, we often do not study or report the costs involved with the interventions we publish.In formulary management, we conduct cost-benefit analysis to find the best therapies.1 Often, plots are constructed with the ordinate as cost, with increasing cost on the top, and effectiveness on the abscissa, with increasing effectiveness moving toward the right. The resulting graph contains 4 quadrants with which to assess potential solutions. In the upper left quadrant are the ill-favored, more costly, less effective solutions. Conversely, the bottom right quadrant contains the preferred, less costly, more effective solutions. The other two quadrants can represent harder decisions because their contents depend on how much cost are we willing to spend for a relative gain. One must ask if this can also be done for instructional interventions.As a mental exercise, I developed a sample costeffectiveness analysis for educational interventions (Figure 1). The data derived for this graph come from rough estimates of cost from faculty members across disciplines at a single university. Effect sizes are from the literature based on academic performance.2-10 I also use an effect size as 0.40 as the benchmark for a good educational intervention. 3 The graph shows activities that help with retrieval (eg, questioning, clickers) are low-cost but have good effect sizes. Cooperative learning strategies vary from think-pair-share to team-based learning, so costs can vary, but generally cooperative learning has large effect sizes. Feedback is similarly associated with large effect sizes, but the cost can vary depending on the type, frequency, or quality of the feedback. The final area is instructional technology (eg, videos, animation, PowerPoint). Technology can do great things-facilitate interaction and combine visual information with auditory information-but traditionally can come at a large cost. Those costs can include script writing time, software purchases, editing, revising, or recording time, and technology updates. In the figure, technology occupies the spaces on the diagonal where there are increased costs and increased effect, thus requiring more judgment on whether to implement these strategies.To generate such graphs we need to consider both effectiveness and cost. Effectiveness can be measured through examination scores, course grades, students' attitudes or confidence, or performance in clinical practice experience. Scores from examinations or quizzes are straightforward but may only assess short-term knowledge retention. Student at...