This is one of the books I bought from Mr. Hiroshi Usami, a major star in the Japanese education world during the Showa era. There's a personal library stamp prominently displayed on the cover, but no markings like pen lines. I remember reading it while wondering what it would be like to hear Mr. Usami talk about the theory of science and math lessons. It's a paperback book with a slipcase. The box has deteriorated over time, with crushed corners and wear. The main body of the book has been protected with film, like those found in library books, to prevent damage. A practical guide to building educational theory. - Title: How to Build a Theory of Lessons - Series: Contemporary Educational Theory Series - Author: Kenji Usami - ISBN: 978-4-625-21378-1 Thank you for looking.