How to secure a high quality of an expert fuzzy model

The aim of this paper is to present some difficulties which can be met when a fuzzy model is built with a domain expert help. The paper discusses methods used at succeeding steps of an expert modeling process and also presents some of them on a real example. The main concern of the paper is a high quality of a fuzzy expert model which can be easily ruined when not all aspects of an expert modeling are carefully tackled. One of the most sensitive is the order of rules presented to the expert during an interview with a model creator. As it will be shown in the paper, on the example of a model for car price evaluation, the most simple and the most popular tabular way of rules presentation can be a reason of creating completely useless expert model.