Abstract
Standard safety analysis techniques are often ineffective when computers and
digital devices are integrated into plant control. The "Safeware"
methodologyand its set of supporting safety analysis techniques (and
prototype tools) includes modeling and hazard analysis of complex systems
where components may be a mixture of humans, hardware and software. This
paper describes one of the Safeware hazard analysis techniques, Software
deviation analysis, that incorporates beneficial features such as HAZOPS
(such as guidewords, deviations, exploratory analysis, and a systems
engineering approach) into an automated procedure that is capable of
hadling the complexity and logical nature of computer software.
