Close to 50 years ago, in March 1967, a landmark article described how to change the unit of analysis in medical care from an individual service to a medical episode. It’s a simple concept, after all: Instead of looking at and analyzing a set of seemingly disjointed services, group them into an episode that defines an illness, an injury, or a treatment. In doing so, suggested Jerry Solon, PhD, of the University of Pittsburgh, it is possible to start making real inferences about the inputs (health care services) that generate an output (treating a patient).