Daisuke Doyo, Katsuhiro Sakamoto, Katsuya Aoki. A Study of Production / Transaction-Related Model Using Control Theory. In Michael J. Smith, Gavriel Salvendy, editors, Human Interface and the Management of Information. Interacting in Information Environments, Symposium on Human Interface 2007, Held as Part of HCI International 2007, Beijing, China, July 22-27, 2007, Proceedings, Part II. Volume 4558 of Lecture Notes in Computer Science, pages 855-862, Springer, 2007.