The course is intended to be valuable to coating engineers, scientists, technicians, and technical managers as well as seasoned thin film scientists who are involved in design, development, and production of optical thin films. Basic principles are reviewed in the beginning to insure that all are using the same nomenclature, but the evolution of the topics then moves into material and techniques useful to even the more experienced practitioners. No extensive background in mathematics or physics is required; extensive graphical illustrations are used. This course deals with optical thin film coating design. It is a companion to, but not a requirement for, the course on optical thin film coating production with another book by the author. Advanced optical thin films are being used increasingly in communications, optical systems, and light control and collection applications. The sophistication of the optical coating industry is advancing rapidly to meet ever increasing demands for performance and production capability. New viewpoints, equipment, and processes are available to support advanced capability and efficiency. Objectives of this course include: to provide increased knowledge and understanding of the many practical aspects of optical coating design, to discuss the techniques and principles discussed, and to elucidate techniques and processes that are commonly successful in meeting optical coating needs.