Although hospitals have been collaborating on efforts to encourage the widespread adoption of best clinical practices, it is not clear what the most successful methods are for doing so. For this project, researchers at Yale University will study a national program sponsored by the American College of Cardiology to reduce the time it takes for patients who have suffered certain types of heart attack to get the life-saving intervention of balloon angioplasty. Drawing from survey data and case studies, the project team will examine how the program diffuses improvements in clinical process and which hospital characteristics facilitate adoption of these improvements. One of the project's key products will be a blueprint detailing the best ways to spread quality improvement interventions throughout the nation's hospitals.