This book presents the reader with the state-of-the-art theory known as Grey Systems Theory and its practical applications. Since its start in the early 1980s, this theory and its applications have been widely noticeable in the entire spectrum of science, technology and management sciences. Not only can the reader learn about the theory but they can also explore the cutting-edge development in this exciting and practically applicable field of study. When one needs to establish models and make decisions, evaluations and/or predictions, they should and could turn to grey systems theory for possible and potentially powerful and more reliable results, even when statistics fails due to small sizes of available samples.