12 case studies will be developed during the project at regional, national, continental and global scale. The case studies will serve as test-beds for the models, the integration methodologies and the Serious Game. In all the case studies, the aim is to study the Nexus trade-offs and the impact of different policies for the future. In all regional and national case studies, we are planning to engage local stakeholders and decision makers (actors) for the development and testing of the strategies, the policies, and the Serious Game. Stakeholders will be involved from the start of the project.