Abstract
The authors have been studying physical quantity dimension indexing as a knowledge management technology about physical phenomena such as faults and their causes in fault tree analysis (FTA). Although the technology enables us objectively and systematically describe and retrieve knowledge about physical phenomena that can be represented with physical quantities, the technology is not applicable to phenomena or event that is not represented with physical quantities such as "a connector falls out". In this study, the authors try to propose an indexing system that is applicable to more various fault events and their causes.
