The concept of uncertainty and its relationship tothe increasingly important concept of information and complexity need to be brought under a newmathematical formulation. This book is intended to make an understanding of this mathematical formalism accessible to students and professionals ina broad range of disciplines and covers the variousissues of uncertainty, information and complexityfrom a broad perspective based on formalism of fuzzyset theory. No prior knowledge of fuzzy set theory orinformation theory is required; the reader is howeverassumed to be familiar with basic notions of settheory, logic and probability theory, though thefundamentals of these subject areas are brieflyoverviewed in the book.The book is suitable as a text at the advanced undergraduate/postgraduate level that covers uncertainty, information and complexity from a broadperspective in mathematics courses in artificialintelligence, engineering and computer science.