The first reading in the evaluation section provides some additional food for thought. Enhancing explanations in knowledge-based systems with hypertext.
Evaluation is implicit in any design and development process.
Still, many designs fail because users find them uncomfortable. This is an argument for making evaluation explicit and including a user element in the process. Designing and evaluating user interfaces for knowledge-based systems. Government information expert systems, A quantitative evaluation. This article summarizes an actual attempt at expert system evaluation.