The Westerschelde is the entrance to Antwerp Main Port and hence of great economic significance.The Westerschelde has an ecologic significanceas well; the area is protected under the Birds Directive, Habitat Directive and the Water Framework Directive.As the body managing the Westerschelde, Rijkswaterstaat is responsible for the implementation of policy as laid down jointly with Vlaanderen in the Long-Term Vision for the Schelde Estuary 2030. Introduction of aforementioned European Directives has made requirements more strict in terms of substantiation, effect forecasting, mitigation or compensation during the planning stages of system alterations. To ensure appropriate responses to future area management issues, both available water system expertise and forecasting method accuracy have been upgraded. This final report describes the expertise developed in the past five years. The report is evidence of greatly enhanced expertise about the Westerschelde in terms of water movement, sediment transports, morphology and ecology, and their interrelations. There now exists better insight into the workings of the Westerschelde system, with modelling options and obstacles being defined. The expertise gained willallow better analysisand forecasting of alteration-effect relations. Yet questions concerning area management and policy remain, which cannot be answered (completely) in the absence of elements of expertise and insight or methods that are required to answer such questions. The challenge is to develop system expertise and forecasting methods to such a degree that In future the answers will be of an increasinglyhigher quality and accuracy.