HSRI’s free simulation model to assist in service planning: The Human Services Research Institute (HSRI) has developed a free, Web-based simulation model, Planning by the Numbers Free (PBN Free), to assist in planning service systems for persons with serious mental illness. PBN Free aids in activities such as budget and bed need planning and preparing for ACA implementation. It presents users with three service system scenarios: a basic service system, a maintenance-oriented system, and a recovery-oriented system. Scenarios are largely prepopulated with data but require some local inputs, such as numbers of consumers to be served at prespecified functional levels, local unit costs of services, and percentage of consumers eligible for reimbursement by Medicaid or other payers. The model forecasts consumers served, service utilization, outcomes, costs, and revenues for any planning period. Users can implement, compare, and save various scenarios. PBN Free is available at http://model.planningbythenumbers.org.