Hazard and Operability Analysis (HAZOP) is a structured and systematic technique for system examination and risk management. It is often used as a technique for identifying potential hazards in a system and identifying operability problems likely to lead to nonconforming products by deviations from design or operating intentions. Identification of such deviations is facilitated by using sets of “guide words” as a systematic list of deviation perspectives. This approach is a unique feature of the HAZOP methodology that helps stimulate the imagination of team members when exploring potential deviations.