Understanding impacts of community planning policy is often lost in the two-dimensional presentation. To facilitate this understanding, the Orton Family Foundation assembled a team to build and adapt technologies to help communities visualize change. The resulting extensions to ArcView GIS include an interactive, fully rendered three-dimensional run-time environment, similar to that found in a flight simulator. Changes can be made in either the two-dimentional "view" or the run-time environment. Simultaneously, an impact analysis extension can evaluate proposed actions and report conflicts. The policy simulation extension employs agent-based modeling techniques to look for trends and likelihood situations.