The old aid architecture is being replaced by a more complex and diverse landscape of development cooperation in which there are new actors, new approaches and attempts to create an overarching architecture which, by embracing all, is expected to be more developmentally effective. The papers in this special issue address different aspects of the new landscape. This paper provides an overview of the landscape and summarizes the findings of the papers. It argues that they show that the new development cooperation landscape is characterized by both vibrant dynamism and systemic inertia and that to achieve progress in development cooperation, more support needs to be given to bottom–up processes of change which can generate effective development outcomes. Copyright © 2013 John Wiley & Sons, Ltd.