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In this project we are developing, validating and feasibility-testing an innovative device using wearable sensors (inertial measurement units IMU and Mechanomyography MMG) that provides measurement and instant movement feedback to therapists and patients to aid arm rehabilitation post-stroke. The IMU and MMG signals generate real-time measures of quality and quantity of movement which are presented on a tablet in formats suitable for patients and therapists. It is designed for patients to use independently at home while practicing standardized everyday activities. It incorporates feedback as motivating visualizations of movement showing them if they have moved in the correct way – such as reaching by extending their arm rather than leaning forward, and using their arm muscles efficiently. The same device is an assessment system for therapists to diagnose specific movement problems (e.g. reduced range of movement or uncoordinated activity between muscles), to inform clinical decision-making, monitor progress and thus increase efficiency and effectiveness of therapy.