Fuzzy logic is a type of many-valued logic which is used to handle the concept of partial truth. The truth value within this field can range from completely true to completely false. In fuzzy logic, the truth values of variables can be any real number between 0 and 1, where both extremes are inclusive. It depends on the observation that people make decisions on the basis of constant and non-numerical information. Fuzzy models are mathematical means for recognizing, representing, interpreting, manipulating and utilizing data and information that are vague and uncertain. It is applied in many fields such as control theory and artificial intelligence. The topics covered in this extensive book deal with the core aspects of fuzzy logic. It covers in detail some existent theories and innovative concepts revolving around this field. Those in search of information to further their knowledge will be greatly assisted by this book.