This project aims to develop a holistic framework for prioritisation of uncertainties in Integrated Water Resource Assessment and Management. This will help scientists, consultants, policy makers and water users better select which sources of uncertainty to address in their work, with what resources, and what methods. Expected outcomes are novel and innovative analytical methods to 1) evaluate current practice in uncertainty prioritisation, 2) communicate when and how to use established and novel uncertainty management techniques, 3) improve prioritisation of uncertainty using proof-of-concept model-based analyses. The project should improve decision making in policy and industry, and societal and environmental outcomes of water management.