This chapter discusses two case studies in the Flemish region of Belgium. The first study concerns the strategic installation of buffer strips in the Dommel Valley, a project initiated by a local organisation that is at the interface of agriculture and nature protection. The second study describes the co-operation between a water-providing company and farmers in the province of Antwerp. Following a brief description of the case studies, the agri-environmental public goods provided by collective action, the factors affecting outcomes in collective action and the role of policies in stimulating collective action are discussed.