Aviation psychology (Johnston, McDonald, & Fuller, 1994) may be defined as the applications of psychology, both its principles and theory, to understanding and analyzing the tasks of pilots, air traffic controllers, and aviation maintenance personnel. It may be distinguished from aviation human factors (Garland, Wise, & Hopkin, 1994; Orlady & Orlady, 1999; Wiener & Nagel, 1989) in that the latter accommodates aviation psychology as well as both the nonpsychological aspects of pilot capabilities (e.g., body dimensions, physiology), and the issues of employing both psychological and nonpsychological principles in the design and evaluation of aviation systems. The focus of the current writing is on the more restricted characteristics of aviation psychology.