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This paper analyzes the root causes of safety-related software errors in safety-critical, embedded systems. The results show that software errors identi ed a s potentially hazardous to the system tend to be p r oduced by di erent error mechanisms than non-safetyrelated software errors. Safety-related software errors are shown to arise most commonly from (1) discrepancies between the documented r equirements specications and the requirements needed for correct functioning of the system and (2)doi:10.1109/isre.1993.324825 dblp:conf/re/Lutz93 fatcat:g5mduai3evgunj7fgos2bkheze