Design Research in the Netherlands occurs every five years to take stock of the state-of-the-art in design research that takes place in all design disciplines in the Netherlands. How has our understanding of design developed through research on this phenomenon? What are the research and development methodologies used to acquire insight in design? What have we achieved in the past period, and what are out expectations for the coming period? Researchers and research groups outline their development over the past five years in position papers, addressing insights, methods, results, and problems. Design Research in the Netherlands 2010 is the fourth edition, following three symposia held in 1995, 2000, and 2005. The five-year cycle allows to take conceptual distance from everyday problems that are often project-specific, and to assess how the field is developing. The proceedings form a valuable cross-disciplinary overview of research on design.