The objective of this research is to use enterprise architecture models in order to develop a decision aid approach to facilitate change management of information systems (ISs). Therefore, we propose to use Organisational Urbanism. One of the principal added-values of this approach is its ability to analyse IS change constraints at the business process level. Organisational Urbanism starts by generating business process cluster maps, which are based on criteria that facilitate changes. These clusters will then constitute pertinent business domains used to structure the deployment of IS changes. Moreover, they can be used to diagnose specific aspects of ISs transformations. Thus, the objective of this study is to help IS managers to better select and implement change scenarios. The clustering method as well as an application for IS diagnostics are explained. The results are illustrated with a case study in partnership with STMicroelectronics.