 The purpose of this project is to refine and further evaluate an online asthma management and education program for urban teenagers. This project is a continuation of Puff City I, a project piloting and evaluating a tailored, school-based, computerized asthma education program for urban teenagers. In this second phase of research, a new version of software Puff City II will be created that will target resistance to change and relapse, and using a tested, theory-based approach to student recruitment, conduct a randomized trial to test the efficacy of this new software. 