The key challenge of modern policy making in the domain of ecosystem management is to prevent or reduce the degradation of ecosystems and their services while meeting increasing demands. Therefore integrated and multi-disciplinary tools are required that give clear insights in the ecosystems ability to supply services, that estimate the size of these services and its impact on human welfare and that predict the consequences of human transformations on its future ability to deliver these services. These tools need to be spatially explicit and should be able to produce maps representing the spatial distribution of supply and demand for ecosystem goods and services, its size and its monetary value. These tools should also be able to assess how the size and value of ecosystem goods and services are altered due to changing land use, global changes, …