METHODS: We utilized a unique online, single-question segmentation using branching logic to tailor education to the individual needs of the specialists. Participants were presented with 3 different single question branching points that tested their knowledge and competence related to management of PAH. Those who answered correctly were directed to an educational activity on differential diagnosis, treating complicated cases, or augmentation therapy. Those who answered incorrectly were directed to an activity on suspecting PAH and referral, early treatment, or monitoring. Online survey instruments using knowledge- and case-based, multiple-choice questions were administered to compare the same participants’ responses to identical questions before and after each activity. McNemar’s chi-squared test was used to determine statistical significance between responses. Cohen’s d was used to calculate the effect sizes of education. The activities launched between May 2014 and August 2014, and data were collected through October, 2014.