AIR, in conjunction with Carilion Medical Center, is developing a series of socio-technical probabilistic risk assessment (ST-PRA) models to evaluate the effectiveness of team training in health care. Three areas of clinical care are being assessed: labor and delivery, surgery, and treatment for acute myocardial infarction (AMI). This study will identify the role of teamwork processes in preventing adverse events. Results from the assessment will be published in two manuscripts.