Instructional materials are the aids/tools used in the transaction of educational lessons to assist active learning and evaluation. Some of the common ones are: Transparencies that contain written content to be projected on screen with the help of an overhead projector (OHP); any kind of printed material which may referto that appearing in textbooks or on handouts; audio cassettes containing recorded content to be utilised in language lessons; computer software, DVD, CD-ROM, computer courseware, on-line tutorials, and so on. So, OHP is only the medium of showing instructional material. It itself is not an instructional material.