The title of this book reflects the editor's wish to present a first step of progress towards AI technology. A number of instances of AI applications to engineering systems are discussd, systematically built up and credited with a high degree of precision as application systems. They constitute case studies and systems developed in Japan, which in themselves have attained an international level of expertise - and have attracted a high level of interest around the world. The current book can be used as a (supplementary) textbook, introducing the state of AI technology application in Japan, together with a concrete presentation of the technology itself. To learn AI technology in detail it is often necessary to study concrete cases or to read program code levels. Knowledge about the objection domain of system development is inseparably involved with learning about the details of applied AI technology.