The document discusses instructional materials and aids, and their appropriate use. It defines instructional materials as educational resources used to improve student knowledge and development. Instructional aids are classified into different kinds - printed materials, audio aids, visual aids, audiovisual aids, demonstration materials, and community resources. Each kind of aid has its own uses and benefits. For example, printed materials are portable and allow self-paced learning, while audio aids engage the sense of hearing and are effective for instruction. The document provides guidelines for selecting and preparing instructional materials to ensure they are appropriate, engaging, and match students' abilities.