Setting Discontinue Rules for Progressive Tests: A Practical and Transparent Toolkit

Progressive tests are a popular tailored test format where items are administered in increasing order of difficulty level and discontinued according to a rule system that should counter excessive response burden for test participants and guarantee efficient use of resources for test administrators. To facilitate evidence-based decision-making for setting appropriate discontinue rules, we propose a transparent approach that charts the impact of varied alternative discontinue rules on accuracy and efficiency. These A-E charts are based on retroactively applying discontinue rules to normative item response data. We show that a universal discontinue rule likely does not exist and that the optimal rule varies as a function of the desired efficiency-accuracy trade-off suitable for the intended test use and target population. The proposed approach provides a pragmatic solution for practitioners, researchers, test developers, and test publishers to rethink the existing discontinue rules, systematically evaluate the alternatives, and set appropriate rules.