A wearable device is adapted to monitor a wearer's physical activity patterns and to provide assistance to the wearer when a need for assistance is indicated. The device includes a processor is programmed to cause the device to collect activity data necessary to determine the physical activity pattern of the wearer over time, to provide the gathered activity data to a server via a network interface for processing to create or update behavioral rules for the wearer, to receive the behavioral rules from the server for comparison to the received activity data, and to provide to the wearer via the user interface assistance information when the wearer has requested assistance or when a check of the wearer's activity against the behavioral rules indicates that the wearer may need assistance. The behavioral rules are created and updated using historical wearer data including location mapping of the wearer over time, identification of a home area, location boundaries, sleep/wake cycles of the wearer, location time comparisons over different time periods, and physiological sensor measurements.