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Despite the many advances in many aspects of explanation provision, most explanation facilities for intelligent systems are limited to answering only a subset of the types of questions that users may want to ask. This limits explanation facilities for many different types of users of expert systems including expert system developers, domain experts, end-users and students using Intelligent Tutoring Systems (ITSs) with expert system modules. One type of question that is not commonly addressed by explanation facilities for expert systems is the negative "Why not?" type of question. This paper outlines the QUE (QUerying the Expert) environment, which addresses this type of question in a domain independent fashion within the rule- and object-based reasoning paradigm. Preliminary observations of use of the QUE environment suggest that it might be beneficial in a number of different expert system explanation scenarios. The current implementation of QUE is an expert system development environment, which will be used by students in an introductory artificial intelligence course to develop expert systems. This paper describes the QUE environment and the "Why not?" question facility.