Textbook in PDF format Introduces the core principles of type-3 fuzzy systems. Explains interval type-3 fuzzy sets and relations, as well as interval type-3 inference and systems. Discusses how to construct interval type-3 fuzzy systems and compares their performance with other fuzzy systems. This book provides the fundamental approaches to designing and using type-3 fuzzy systems in real-world applications. Basic MatLAB codes are provided to use type-3 fuzzy systems in a straightforward scheme. The main differences between type-3 fuzzy systems and other types are analyzed and compared. The effectiveness of type-3 fuzzy systems is analyzed and studied in various applications, such as robotics, intelligent control systems, and data science