The major global crises of the past four years – financial, fuel, food, climate – have collectively had a dramatic impact on people's lives and livelihoods. Have they also had a large impact on core ideas underlying mainstream development? Drawing on a number of Reimagining Development case studies and on a much wider literature, this article examines the impacts of the crises on lives and livelihoods and also on core development ideas. First the article sets out why the current time is a good one for reimagining. Then it highlights some of the new ideas that are emerging and some of the older ones that are making a reappearance. Finally, the article reflects on the challenges of reimagining development and processes that are important if new ideas are to make a difference.