This book, now in its third edition, conveys the fundamentals of the systematic use of computer-aided methods, procedures, and tools in product development. It provides its target audiences with the essential knowledge for the successful application of CAx systems in a concise and clear format. The procedures and examples are based on experiences from industry and academic practice, where they have proven their efficiency. The third edition has been thoroughly revised, and the circle of authors has been expanded. This edition includes not only aspects of different modeling types, mechatronics, and knowledge processing but also discussions on system concepts and model construction, which form the basis for CAx applications. All of these increasingly influence manufacturing technology and modern vehicle, machinery, and plant construction, bridging the gap to systems engineering.