To walk the talk of the transformative potential of design, today’s designers, planners, and innovators must seriously pursue design that contributes to positive environmental and social change. But how to go about pursuing it? Design participation presents doable and demonstrated ways by which design can become a major contributor to social and environmental change. This entails a shift from seeking to define solutions to opening spaces in which others—activists, entrepreneurs, civil servants, neighborhood communities, politicians—can effectively elaborate on and find (re)solutions to the issues they are facing. Indeed, the last decades have seen an ever-widening public participation in transformative projects by industry and public administrations alike, across the globe. It is now time to pursue design participation for real: in earnest, skillfully and for real problems. On the basis of a twenty-year research program with major projects, Design Participation provides an encompassing resource for how to think, reflect, plan, and work in design participation in different settings and for different issues. It develops a new vocabulary premised on types of work involved in getting design participation done for recognizing the dynamics that make participation prosper (or not). To this end the opening chapter elaborates on seven moves that are needed to understand design participation: From design solutions to design participation; From participatory design to design participation; From professional designers to those who engage people in design participation; From participatory ideals to design participation work; From concept design workshops to active use and design-in-use; From invited participation to invested participation; and From designable change to catalyzing actions into motion to achieve sociotechnical change. With these insights in place the chapter one ends by defining what design participation is how it relates to some of the key neighboring concepts and areas of research and practice.