Medical science has made enormous strides in decreasing mortality and suffering, but there is no doubt that treatment can also sometimes cause harm. Ofri places the issues of medical error and patient safety front and center in our national healthcare conversation. She explores the diagnostic, systemic, and cognitive causes of medical error, and advocates for strategic use of concrete safety interventions such as checklists and improvements to the electronic medical record, while focusing on the full-scale cultural and cognitive shifts required to make a meaningful dent in medical error. -- adapted from jacket