A general methodology for modeling with words

A methodology for construction of models using genuine expressions of natural language, namely the so called evaluative linguistic expressions is presented. A sophisticated formal theory of their meaning provides us a tool with a great application potential. These expressions occur also in conditional clauses of natural language which are gathered into linguistic descriptions, for example, of complex control or decision strategy. When applying a special reasoning method - perception-based logical deduction - we obtain models which effectively utilize expert knowledge and can mimic the way how people behave in complex decision situations. Applications especially in control and decision-making are also mentioned.