Doctors save lives, but they can sometimes be insufferable know-it-alls who bully nurses and do not listen to patients. Medical schools have traditionally done little to screen out such flawed applicants or to train them to behave better, but that is changing. At Virginia Tech Carilion, the nation's newest medical school, administrators decided against relying solely on grades, test scores and hourlong interviews to determine who got in. Instead, the school invited candidates to the admissions equivalent of speed-dating: nine brief interviews that forced candidates to show they had the social skills to navigate a health care system in which good communication has become critical. The new process has enormous consequences not only for the lives of the applicants but, its backers hope, also for the entire health care system. It is called the multiple mini interview, or M.M.I., and its use is spreading. At least eight medical schools in the United States -- including those at Stanford, the University of California, Los Angeles, and the University of Cincinnati -- and 13 in Canada are using it.