This article argues that the merger of simulations and problem-based learning (PBL) can enhance both active-learning strategies. Simulations benefit by using a PBL framework to promote student-directed learning and problem-solving skills to explain a simulated dilemma with multiple solutions. PBL benefits because simulations structure the information students receive to focus learning on the intended curriculum and increase the strategy's effectiveness in a wider variety of venues. A combined strategy--a PBL simulation--places its simulation at the forefront of learning and helps students and teachers sift through the overwhelming complexity that can arise in a more pure PBL. The authors illustrate the strength of a PBL simulation with an economics unit on trade, titled THE GREAT AWAKENING. (Contains 1 table and 5 notes.)