In this chapter, we examine the ways in which the Internet was used to run a case study-based, decision-making simulation in an academic writing class of 26 Japanese students studying English at a computer science university. The students had to construct an online glossary aimed at building sufficient background knowledge related to the simulation and then, in teams, create online documents demonstrating an understanding of the simulation problem and offer potential solutions. Information was delivered to students via the Web, and all documents produced by students were posted to their homepages. Assessment and observation revealed that the objectives of the simulation were achieved and that students were quite motivated throughout the simulation because they were able to make connections between the simulation activities and their chosen career. It is hoped that this study will act as an impetus for additional online simulation experiments in academia, business, and government.