Discrete Event Simulation (DES) is a novel system modeling technique that allows for the evaluation of the potential costs and personnel needed for mental health services in school. A case study is presented to illustrate how DES could be used by a school's decision makers to help plan for implementation of an integrated mental health service model. Discrete Event Simulation was used to model the personnel, time, and costs of an integrated mental health service model within a school setting. In addition, costs are calculated and then compared to a business as usual model. Data from the present investigation indicate substantial cost savings of implementing a prevention oriented mental health intervention model within a school setting. In a school of 1000 students, the prevention model could result in an annual cost savings of approximately $30,000 as well as a 50% reduction in disciplinary referrals and 22% reduction in suspensions. Results from the present investigation indicate substantial savings in financial resources and overall numbers of disciplinary infractions when implementing a prevention model. The DES allows for customization of personnel and time to modify the model and resulting output to local conditions. These data may allow school administrators to modify resources to meet student needs. In addition, cost data can help address some of the common implementation barriers associated with adoption of universal screening and preventative mental health services.