A Measure of Malpractice tells the story and presents the results of the Harvard Medical Practice Study, the largest and most comprehensive investigation ever undertaken of the performance of the medical malpractice system. The Harvard study was commissioned by the government of New York in 1986, in the midst of a malpractice crisis that had driven insurance premiums for surgeons and obstetricians in New York City to nearly $200,000 a year.

The Harvard-based team of doctors, lawyers, economists, and statisticians set out to investigate what was actually happening to patients...