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The aim of the I-X research programme is to provide a general framework for performing mixed-initiative synthesis tasks, along with a set of tools that supports its use. This framework arises from and builds upon seminal work at the University of Edinburgh in the field of Artificial Intelligence planning. In this paper we describe the framework and tools, before describing the application of I-X to the task of planning and coordinating expeditions to remote locations – such as an attempt on Everest. We call this application I-Ex.