The formal context analysis theory [1] represents all the objects from the knowledge domain as sets of attributes, stored in a formal context. The procedure of merging several formal contexts [2] leads to the growth of the knowledge domain and makes the artificial model closer to the reality. During the merging procedure a number of pseudoconcepts, which have inconsistent attributes, are verified. Comparison of inconsistent sets of attributes with those that correspond to real formal concepts allows building a certain amount of rules. These rules can be used to expand the knowledge base of the FIACR system, described in [3].