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Expert systems are computer programs that rely on the expertise and experience of human-experts, and as such they simulate their reasoning and behavior in a particular problem domain. They are often used in business, especially in finance for credit process, portfolio management, tax planning, financial planning and banking diagnosis.

Development of creditworthiness expert system is a very complex process, and requires an extensive analysis of various financial indicators and various aspects of business, like structure of revenues and expenditures, business cost-effectiveness, and financial position of companies, to name only few. This is why expert systems support is very much welcomed in this area.

In this article we described the development process of one such system.  The steps undertaken after the knowledge acquisition are presented: structuring the acquired knowledge, its placement into the knowledge base and different ways of connecting and relating the analyzed individual aspects of creditworthiness, the main expert system comprises of. In the article, special emphasis is on incorporation of peculiarities and limitations of a software tool in which the system was developed - expert system's shell Exsys Corvid, in the system design.