Software shells for the development of expert systems are now readily available. The challenge for corrosion expert systems developers is in efficient capture of expert knowledge and development of "user friendly" interfaces to meet customer needs. Development of large materials performance expert systems requires a systematic approach to capturing knowledge. A model, for capturing materials performance knowledge, involving definition of required attributes, preparation of a hierarchical tree structure and spreadsheets of advice to be given for each tree branch is described and illustrated by an example expert system.

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