Navigating evidence, legitimacy, and delivery: a three-dimensional framework for behavioral policy design

What the paper says

Abstract Behavioral public policy faces the triple challenge of assembling robust evidence, securing democratic legitimacy, and navigating implementation constraints. We introduce a three-dimensional policy cube that positions interventions along evidence robustness (E), policy contestation (C), and implementation feasibility (F). Linking each axis to the Capability–Opportunity–Motivation (COM-B) model grounds the cube in behavioral theory, while equity-sensitive scoring captures distributional and administrative-burden effects. We use COM-B as a mechanism-first heuristic for anticipating which governance constraint is likely to be most binding for a given intervention, while recognizing that most real policies load onto multiple COM-B components and therefore multiple cube axes. To support reproducible placement, we provide a transparent scoring rubric (with a worked example) for assigning E, C, and F coordinates. To demonstrate its analytic value, we run a Monte Carlo simulation of fifty stylized interventions over five years. True effects are drawn from a bimodal distribution; replication precision tightens with evidence robustness, backlash probability, and severity rise with contestation, and fidelity decays as a function of feasibility. The cube synthesizes behavioral science, implementation research, and political economy in a single diagnostic, yielding governance templates that range from fast-tracking technocratic sweet spots to sandboxing high-risk (“zombie”) policies. It provides researchers with a measurement agenda, practitioners with a portfolio tool, and policymakers with an adaptive oversight guide.