[...] * CityChrone++ is one of the instantiations of a larger platform dubbed what if-machine (link to whatif.caslparis.com), aimed at providing users with tools to assess the status of our urban and inter-urban spaces and conceive new solutions and new scenarios. The platform integrates flexible data analysis tools with a simple scenario simulation platform in the area of urban accessibility, with a focus on human mobility. In this framework, it will be important to parallel the platform with effective modelling schemes, key for the generation and the assessment of new scenarios.