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Software safety (sometimes called software system safety) is an engineering discipline that aims to ensure that software, which is used in safety-related systems (i.e. safety-related software), does not contribute to any hazards such a system might pose. There are numerous standards that govern the way how safety-related software should be ...
Nancy G. Leveson is an American specialist in system and software safety and a professor of Aeronautics and Astronautics at Massachusetts Institute of Technology (MIT), United States. [ 1 ] Leveson gained her degrees (in computer science, mathematics and management) from University of California, Los Angeles , including her PhD in 1980.
The Power of 10 Rules were created in 2006 by Gerard J. Holzmann of the NASA/JPL Laboratory for Reliable Software. [1] The rules are intended to eliminate certain C coding practices which make code difficult to review or statically analyze.
Some safety organizations provide guidance on safety-related systems, for example the Health and Safety Executive in the United Kingdom. [6] Risks of this sort are usually managed with the methods and tools of safety engineering. A safety-critical system is designed to lose less than one life per billion (10 9) hours of operation.
The SOFTWARE SYSTEM is software safety class A if: the SOFTWARE SYSTEM cannot contribute to a HAZARDOUS SITUATION; or; the SOFTWARE SYSTEM can contribute to a HAZARDOUS SITUATION which does not result in unacceptable RISK after consideration of RISK CONTROL measures external to the SOFTWARE SYSTEM. The SOFTWARE SYSTEM is software safety class B if:
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"The software level establishes the rigor necessary to demonstrate compliance" with DO-178C. [10] Any software that commands, controls, and monitors safety-critical functions should receive the highest DAL - Level A. The number of objectives to be satisfied (some with independence) is determined by the software level A-E.
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