Abstract: Embodiments discussed herein provide a passive monitoring system for use in a residential independent living framework. In some exemplary embodiments, the system may be used to alert a primary caregiver of a possible decline or change in an activity of daily living (“ADL”) of the monitored individual. The system may collect usage data associated with, for example, electrical devices at the living quarters of the monitored individual. The collected data may include data pairs of time samples and voltage data associated with one or more electrical devices that the monitored individual is expected to utilize. Applying various filters to the collected data, a possible decline or change in ADL of the monitored individual may be identified.