In 1979, Devi at the University of Illinois published an article ("About Smocks and Jocks") in which he contended that it was difficult to apply specific laboratory research to sporting situations. For instance, how can the pressure of shooting a foul shot in front of 12,000 screaming fans be duplicated in the lab? Martens contended: "I have grave doubts that isolated psychological studies which manipulate a few variables, attempting to uncover the effects of X on Y, can be cumulative to form a coherent picture of human behavior. I sense that the elegant control achieved in laboratory research is such that all meaning is drained from the experimental situation. The external validity of laboratory studies is at best limited to predicting behavior in other laboratories."  Martens urged researchers to get out of the laboratory and onto the field to meet athletes and coaches on their own turf. Martens' article spurred an increased interest in qualitative research methods in sport psychology, such as the seminal article "Mental Links to Excellence."