A teaching strategy refers to the principles and methods employed by teachers to enable student learning. These strategies are decided depending upon the subject matter to be taught and capabilities of the learner. Lesson study is a teaching method which involves a group of teachers meeting regularly over a period of time. Its objective is to design, test, improve and implement one or several research lessons. The research lessons focus on specific teacher generated problems, goals or visions and are recorded for analysis. The approach of lesson study is used extensively in Japan to teach mathematics and is gaining worldwide recognition as an effective technique to teach multiplication of natural numbers. The book studies, analyses and upholds the tenets of lesson study and its utmost significance in modern times. Also included herein is a detailed explanation of the various concepts and applications of lesson study. From theories to research to practical applications, case studies related to all contemporary topics of relevance to this field have been included in this book.