Project Engage: A Wrist Biosensor-based mHealth Suite to Support Alcohol Intervention in Young People Living With HIV

We will conduct a 30-day micro-randomized trial (MRT)--a clinical trial design for developing and optimizing mHealth interventions to test which engagement strategy works better, for who, and under what condition. A subset of the participants will be micro-randomized in the morning and in the evening, to either a prompt delivering non-contingent small reward (reciprocity); or a prompt containing feedback on self-monitoring progress based on dynamic self-regulation theories (personalized feedback); or no prompt.