A method, including:



receiving observation data from one or more data-capturing devices, the observation data representing a presence of an individual;
processing the observation data to generate identity data representing the identity of the individual, and to detect at least one physiological characteristic or behavioural characteristic of the individual;
retrieving behavioural profile data of the individual based on the identity data; and

comparing the detected characteristic to at least one expected characteristic represented by the behavioural profile data of the individual to identify an abnormality of the individual.