This is an introductory book in the relatively novel field of fuzzy theory. The first part deals with the basic notions of fuzzy sets and logic, operations on fuzzy sets and relations between fuzzy sets. The second part covers the basics of fuzzy control, e.g., the different type of fuzzy controller and their brief analysis. The authors also address the practical topic of fuzzy reduction techniques, including the mathematical background, fuzzy rule interpolation methods and approaches in structured rule bases. The book ends with some typical examples from the practice.