PLANET is an expert system for audit risk assessment and audit test selection. At present it is undergoing worldwide field testing by Price Waterhouse audit teams. As a case study, PLANET illustrates a complex interplay of audit methodology issues and expert systems development techniques, and reinforces the validity of many of the widely reported lessons learned about successful expert systems development during the 1980s. However, the experience also challenges elements of this received wisdom while exposing special issues arising in the development of expert systems in the field of auditing.
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