A theory of accident causation and control based on the premise that the
universe is a single system and composed of many related subsystems. An accident
occurs when a human or a mechanical segment of a system fails or malfunctions.
The system safety approach reviews the accident to determine how and why it
occurred and what steps could be taken to prevent such an incident. Preventive
actions utilized under this approach include potential hazard recognition and
identification, consistent use of safety-related design in all aspects of the
system and subsystems, evaluation of all procedures for meeting safety requirements,
and maintaining sustained awareness of all safety measures and techniques.