Szukana fraza: [Abstract = This paper describes a new approach, the HeKatE methodology, to the design and development of complex rule\-basedsystems for control and decision support. The main paradigm for rule representation, namely, eXtended Tabular Trees\(XTT\), ensures high density and transparency of visual knowledge representation. Contrary to traditional, flat rule\-basedsystems, the XTT approach is focused on groups of similar rules rather than on single rules. Such groups form decisiontables which are connected into a network for inference.]