Deltas' Dealings with Uncertainty (DoUbT) is an ORA project funded by the Dutch, UK, French and Japanese national funding organizations for the period 2016-2019. DoUbT innovatively combines science and technology studies (STS) with the anthropology of development to interrogate how uncertainties are understood and dealt with in environmental planning. We focus on four deltas with diverging cultural and historical trajectories and contemporary dynamics: the Ganges-Brahmaputra, the Mekong, the Chao Phraya and the Irrawaddy.