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Abstract
To be used by experts developing expert systems largely by themselves, an expert system shell must provide mechanisms for common problems in the domain. MEDZ (Meta-Ebenen- Diagnosesystem or meta-level diagnostic system), which was designed for classification problems, directly addresses typical requirements such as cost-effective data gathering, evaluation of changing data in follow-up sessions, and probabilistic and nonmonotonic reasoning. It is a commercial product and runs in COMMON-USP on the IBM-XT and on the SYMBOLICS-LISP machine.