Abstract
We present initial work on an expert system that will help users to debug their Pascal programs. This system asks the user questions concerning attempts to build a 'partial model' of the program - a model of those aspects of the program likely to relate to the error. This contrasts with previous systems in which a complete model of the user's program is built and compared to templates of correct versions of the program. The advantages of this approach are greater flexibility, greater student involvement in the debugging process and lower computational overheads.
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