The Jenkins activity survey is one of the most wiely used methods of assessing Type A behavior. The JAS is a psychometric survey of behavior and attitude designed to identify persons showing signs of Type A behavior. The test is multiple choice and self-administered. It was published in 1979 by C. David Jenkins, Stephen Zyzanski, and Ray Rosenman. The terms Type A and Type B personality were originally described in the work of Rosenman and Friedman in the 1940s.