Safety Case

A reasoned and supported statement of the level of safety achieved for a system

A safety case is a reasoned and supported argument, one way of documenting and providing assurance to the stakeholders that a system is acceptably safe.

A safety case generally consists of the argument, usually based upon following a particular safety standard, and the supporting evidence, such as is summarised in or referenced by the hazard log.

A safety case is generally produced incrementally during the life cycle, and can be delivered at milestones such as before progressing to detailed development and before installation and commissioning. Other deliveries may be required during or after operation of the system if information from activities such as monitoring and/or incident investigation require it.

Other similar concepts are embodied in the Safety Assessment Report of MIL-STD-882C "System Safety Program Requirements", or the submission as described in "Guidance for the Content of Premarket Submissions for Software Contained in Medical Devices".


CSR Sugar, in the control of their Cane railways.


Citect, in their replacement of the power distribution system for the rail network run by QR.


Boeing Australia Limited, Aerospace Support division in their integration of a Stand Off Weapon and a Secure Voice capability to the F/RF-111C for the Royal Australian Air Force (RAAF).