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Real world applications of qualitative reasoning: Introduction to the special issue

Qualitative physics has attracted much interest from the artificial intelligence research community in the last decade. Every year since 1986 has seen two to three technical paper sessions devoted to qualitative reasoning and modeling of physical devices in the National Conference on Artificial Intelligence. A successful international workshop on qualitative reasoning about physical systems has been held every year since 1987. The emphasis in qualitative physics on problems of reasoning about physical systems where there is incomplete information, and abstraction/aggregation of models of physical systems as well as of analysis results makes the technology relevant to many real-world industrial problems. Many applications of qualitative physics technology have been reported in various tasks such as diagnosis, design, tutoring, real-time monitoring and hazard identification. The purpose of this special issue on applications of qualitative reasoning is to showcase some of the recent applications.