Knowledge-based support of system analysis for the analysis of Failure modes and effects

Abstract Failure mode and effects analysis (FMEA) is an important method of preventive quality assurance. However, even 30 years after its introduction in the aerospace industry and despite more than 10 years of experience in using this method in development, FMEA is still a challenge for many companies. This paper analyses the problems with the conventional way of carrying out an FMEA. It is argued that a knowledge-based approach to FMEA can alleviate most of these problems. The solution chosen in the WIFA project is presented. WIFA employs various knowledge bases to support complete and precise descriptions of processes and products, and to facilitate the later reuse of the knowledge collected during an FMEA. The essential features of these knowledge bases, and their use in FMEA, are described.