“…The variables used in hypotheses 1, 2, and 9 were suggested by Williams [19]. Hypotheses 3, 4, 6, 10, and 11 were largely based on the results of previous investigators [2,10,13,15,16,19] who found one or another of the particular measures in question significantly related to performance under various types of stress conditions. Hypotheses 5, 7, 8, and 12, on the other hand, were derived from clinical experience.…”