The City Science group uses simulations and visualizations to explain to stakeholders, including citizens, the various "what if" scenarios involved in urban planning. The knowledge and indicators obtained from these simulations are often greatly influenced by the site (neighborhood) and the subject matter. A community that holds various discussions around the simulation with a wide range of possible scenarios is necessary to discuss our environment. At this point, communication between the "experts" who create the simulations and the people who receive them is crucial.