Cook School District is a Web-based simulation designed to allow teacher candidates an opportunity to explore connections between their actions as teachers and the learning and engagement of simulated students. The simulation provides a setting in which to practice the processes inherent in teacher work sample methodology (TWSM). The outcomes of TWSM include analyzing the context in which teaching and learning will occur; identifying outcomes to be learned; designing and administering a pretest to evaluate prior knowledge; designing and delivering instruction, differentiating curriculum, instruction, and/or assessment as appropriate; and post assessing student learning to determine the value added or teacher effects on learning and engagement. Quasi-experimental research demonstrates the efficacy of the simulation to (a) improve scores on a real teacher work sample, (b) improve field-based lesson teaching performance, and (c) affect users perceptions of their skillfulness and valuing of concepts underlying teacher work sample methodology. (Contains 4 figures and 5 tables.)