ogic branching tools, and survey scheduling options. Passive EMA options include GPS tagging (of survey responses), Geo-fencing (triggering surveys at specific locations) and smartphone sensor logging (light and noise level, screen brightness, screen locked/unlocked, humidity, ambient temperature, barometric pressure, phone/SMS activity log, and basic device information). With the online back-office, researchers can invite participants, monitor study compliance and download data (in common data formats such