“…Normal accident theory proposes that because these production systems are technologically complex, highly interdependent, and opaque, seemingly small technical troubles and subtle organizational politics will inevitably accumulate to overwhelm the capacities of risk handlers, and accidents or serious near accidents will occur (Perrow, 1984(Perrow, , 1994a(Perrow, , 1994bSagan, 1993Sagan, , 1994. High-reliability theory, recognizing the successes of risk handling, aims to explain the sociological, political, and cognitive capacities of high-hazard organizations to avoid mishaps (LaPorte, 1994b;LaPorte & Consolini, 1991;LaPorte, Roberts, & Rochlin, 1989; LaPorte & Rochlin, 1994;Rochlin, 1993). The vignette illustrates the premises of each theory in that, given &dquo;tight couplings&dquo; and system complexities, one incident challenged ultimate safeguards and thereby introduced new complications, but the compensatory activities of risk handlers prevented untoward consequences.…”