Teaching students with disabilities in an inclusive classroom may be regarded as a challenge for teachers accustomed to teaching in the regular classroom; therefore teachers should require the basic characteristics of effective teaching. The use of educational materials makes learning and comprehension easier for students at all levels. For students who have learning difficulties, educational materials are more important. In this research study, it is aimed to determine classroom teachers' ways to choose, develop, and use of instructional materials for inclusion students in their classes. It is also important to support the development of inclusion programs by using the knowledge gathered in this research study. Qualitative and quantitative data collected throughout the research study display the inefficiency of teachers to develop and use instructional materials for inclusion students. (Contains 3 tables.)