TRANUS is a software used to simulate the impact of plans of urban development. It uses an extensive array of parameters to simulate the environment in a mathematical model. It is however difficult to use, especially when wanting to study the impact of one parameter on the rest of the model. Doing so currently requires to enter a new set of data through the graphical user interface, even if only one variable is modified. In order to use the software to study the impact of one variable on the model, a new tool making this easier is required.