This project uses mobile technology to capture the emotions, physiological reactiity, and vocally recorded interactions for ‘a day in the life’ of romantic dating couples. Investigation of the complex interplay within and across partners in their emotions, vocalizations and physiology will be used to identify individual and co-regulated variables associated with dating aggression. The study’s long-range contribution is informationon risk and protective factors in the continuity of aggression from family relationships during adolescence into dating relationships in young adulthood.