Simulations have long been an important pedagogical tool in the fields of Politics and International Relations. Their more widespread use, however, has been prevented by a combination of perceived barriers to entry in required time and planning. This article seeks to help faculty overcome these barriers and to lessen the burdens associated with simulation-based pedagogy by presenting instructors with a clear, systematized, and research-based approach to simulation development. This article draws from research in the Scholarship of Teaching and Learning, Instructional Design, and the learning sciences to provide Political Science and International Relations instructors with a clear model and associated step-by-step approach to designing, implementing, and evaluating educational simulations. This model--which we label DImE for Design, Implementation, Evaluation--is drawn from pedagogical best practice but with a strong consideration for practical implementation of simulations in the university classroom. In short, it seeks to provide faculty with a fundamental piece in their "teaching tool kit" for developing their own simulations.