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Dementia causes a progressive degradation of mental abilities leading the patient to forget and have problems thinking and reasoning. As the disease is progressive it is possible for patients in the early or intermediate stages to manage within their own home; however as the disease becomes more serious and the patient more susceptible to forgetfulness or confusion the health and safety risk within the home increases. This paper outlines a system targeted at monitoring patients in an unobtrusive way to minimize risk exposure within the home and alert a patient when a risk is present or a local authority when a risk is ignored. We proposed the use of Multi-agent systems for ambient assisted living and at present there is no system that combines the information obtained from a range of sensors to provide an ambient assisted living system focused on risk analysis and reduction for dementia patients.