I am currently researching the use of Information and Communication Technologies as tools for preventative care and diagnosis support in elderly population. Our current approach uses accelerometers and video sensors for the recognition of instrumental daily living activities (IADL, e.g., preparing coffee, making a phone call). Clinical studies have pointed the decline of elderly performance in IADL as a potential indicator of early symptoms of a dementia case (e.g., Alzheimer’s’ patients). IADL are modeled and detected using a constraint-based generic ontology (called SCREK). This ontology allows us to describe events based on spatial, temporal, and sensors data (e.g., MotionPOD) values.