The I-PASS Study was initiated in response to mounting evidence that communication and handoff failures are a root cause of two-thirds of "sentinel events" - serious, often fatal, preventable adverse events in hospitals. The Agency on Healthcare Research and Quality (AHRQ) and Joint Commission have identified improving handoffs in care as a priority in nationwide efforts to improve patient safety. Research on handoff tools and processes has identified team training, introduction of verbal mnemonics, and use of written or computerized tools as strategies to improve handoffs and reduce medical errors. This study was designed to evaluate the effect of a resident handoff bundle (RHB) comprised of these three strategies in addressing medical errors, verbal and written miscommunications, and resident workflow and satisfaction.