System safety is a concept in safety engineering that calls for engineers to use a systems-based approach to developing risk management strategies. While traditional safety strategies focus on modifying systems to avoid the conditions that resulted in past system accidents, system safety analysis focuses on proactively identifying and analysing hazards before an accident can occur. Once these hazards are understood, engineers can then propose changes to the system to eliminate, control, and/or manage them throughout the life-cycle of the system.