The objective of this work package is to develop the user interface for the hardware and software for both patients and therapists. The user interface will guide patients through sets of exercises while providing various elements of feedback to encourage and inform the patient. Similarly the system will provide the therapist with a range of performance metrics and historical trends so that a patient's progress over a period of time can be assessed. The system will also allow therapists to set up exercise regimens for patients which can then be downloaded to the equipment used by each patient. Similarly, the system will allow upload of performance data from the patient equipment to the therapist system. A secondary aim is to develop novel techniques to guide and encourage patients – for example by using games and auditory plus mechanical cues (such as vibration) to ensure the process is as intuitive and interesting as possible.