Ecological momentary assessment (EMA), a body of work developed in the late 90s and early 00's, focuses on using data collected from subjects living their daily lives in their natural environments using minimally invasive techniques to improve the quality of the data collected. Mental health telemetry (MHT) is an evolution of EMA. MHT was developed here at Sunnybrook in partnership with the Faculty of Medicine at the University of Toronto; it uses wirelessly networked handheld computers - typically, cell phones - to collect self-report data on symptoms of illness and then transmit it in real-time to a central database. Principal advantages of MHT over EMA include (i) the ability to time- and date-stamp data, thus eliminating retrospective record completion, and (ii) the ability to observe and monitor data flow in real-time, without having to wait for participants to upload or deliver the data (e.g., at their next doctors' appointment).