There is growing worldwide interest in Japanese Lesson Study as a form of professional development, with adaptations of Lesson Study taking place in hundreds of schools clusters in USA, large-scale adoption in the UK, and smaller scale implementation in Australia, and many other countries, including Chile, Indonesia, Malaysia, Mexico, Peru, Philippines, Singapore, Thailand, and Vietnam. This presentation will use classroom video to illustrate the typical Japanese structured-problem-solving research lessons that form the basis for Lesson Study, and discuss how they are planned, the role of the teacher, and the use of Lesson Study as a means of professionaldevelopment