In this book, a wide range of fuzzy mathematical technique of AHP and its applications is described such as fuzzy set theory, intuitionistic fuzzy set theory, interval-valued intuitionistic fuzzy set theory and interval type-2 fuzzy set theory. The book is mathematically arranged and written in a simple way that all materials and concepts accessible for the students and researchers in any kind of fields. The procedure is illustrated and demonstrated by case studies in different types of applications. These case studies are essentially important for readers to guide them in comprehending easily the procedural knowledge of AHP based methods.