Towards validation of expert systems as medical decision aids.

Expert system evaluation is an important step in knowledge engineering development and is clearly not a simple process. The aim of this paper is to introduce methodological aspects of medical knowledge base validation. We distinguish two components of the evaluation: verification and validation. In the first part, the difficulties of evaluation are analysed, problems with some techniques used in the evaluation process are discussed. In the second part, our experiment gives guidelines to present these aspects and underline what and when to evaluate.