Applying Adaptive Safety Analysis Techniques

Authors:
Robyn R. Lutz;Hui-Yin Shaw
Affiliations:
-;-
Venue:
ISSRE '99 Proceedings of the 10th International Symposium on Software Reliability Engineering
Year:
1999

Citing 6
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Abstract

Current needs for high-reliability, reusable software; rapid, evolutionary development; and verification of innovative software architectures have focused attention on improving techniques for analyzing the safety and reliability of embedded software. The work reported here integrates two successful safety analysis techniques which have been used separately on software and hardware into the system hazard analysis. This process combines Software Failure Modes and Effects Criticality Analysis (SFMECA) and Software Fault Tree Analysis (SFTA) in a way that can be readily adapted to a particular project's evolving system needs. The technique was used on two recent space instruments: the Mars Microprobe Project and the Earth Orbiting System's Microwave Limb Sounder. The main lessons learned from this experience are discussed: (1) flexible use, (2) a risk-driven rather than sequential approach, (3) "zoom-in/zoom-out" use, (4) SFMECA and SFTA as complementary techniques, (5) preserving traceability, and (6) applicability to fault protection software.