The document discusses different types of instructional materials that can be used in the classroom, including real objects (realia), models, printed materials, visual aids like pictures and charts, and bulletin boards. It notes benefits and limitations of each type. Realia provide concrete learning experiences but have issues with storage and safety. Models are more practical than realia and can simplify complex concepts, though they may oversimplify. Printed materials allow varied approaches but can divide attention. Visual aids help visual learners but require clarity. Bulletin boards promote visual learning but must be monitored to avoid distraction.