This article attempts to build a simulation model of the impacts of factors that facilitates faculty adoption of Web-Based Instruction (WBI) from the perspective of the faculty’ stages of concerns. Faculty have different concerns as they integrate new technology into their teaching. Without reducing these concerns, WBI integration will not be successful. Four main stages of faculty concern (information, personal, management, and impact concern) were identified based on Hall’s concern-based adoption model. Reviewing literature on the diffusion of on-line education, we have identified support factors that may decrease faculty’s concerns for adopting WBI in their education settings. These factors were incorporated into the simulation model in order to test the potential impacts of the factors on faculty adoption of WBI. The current simulation model built in Stella® will aid educators or administrators to evaluate the impact of the factors on adoption of WBI.