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PAUQ (Practical data Assimilation and Uncertainty Quantification) is an international workshop on data assimilation and uncertainty in the geosciences. At the crossroads between subsurface georesource utilisation and digital twins building era, it is now time to connect advanced research tools in data assimilation with a practical twist, to drive an operational decision making. ​ One of the main difficulty to accelerate the development of subsurface usage is the design and use of practical solutions. Very advanced computational methods already exist but are not in use in industry due to their lack of applicability on real datasets, mainly due to the uncertainty attached to them. In fact, there is a lack of proper identification and characterisation of those uncertainty in real datasets, and how to handle them on the data assimilation workflow.​ Consequently, the very aim of the workshop is to gather experts in their respective fields and lay out real data peculiarity and sophisticated computational tools to address the timely georesource topic.