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Uncontrolled hypertension constitutes a major challenge for healthcare systems. Home blood pressure monitoring (HBPM) is widely recommended and may lower BP when combined with other supports. However, scalable and systematic HBPM interventions are lacking and the behavioral mechanism(s) through which BP is lowered remain poorly understood. Our team designed the MyBP program with video-based education and a fully automated, bi-directional texting to facilitate longitudinal HBPM. Exit interviews conducted after six-weeks of MyBP revealed that most participants made at least one healthy behavior change. The current study examines why participants made healthy behavior changes, and what specific components of the MyBP program facilitated those changes. Adults with hypertension were recruited from either an urban emergency department, a primary care office, or a hypertension referral …