Wageningen University and Research Centre is known for its practical and societally relevant research in spatial development. Stakeholders currently put much emphasis on participatory processes in landscape planning procedures. This poses a special challenge for research. What role does research play in our present world characterised by complexity, competing claims and development needs, and an increased concern for climate change and environmental impact? In the book ‘Knowledge in action’ we explore different types of transdisciplinary research that scientists engage in. Depending on the societal context and the interests of local citizens, researchers apply different research approaches to optimally incorporate the various points of view in their research and promote processes enhancing dialogue and shared results.In the book, authors present their research experiences. their theoretical inspiration, the research methodology applied to consult, share and collaborate with societal actors in order to create options for change.