The document discusses various instructional aids that can be used for teaching, including blackboards, bulletin boards, charts, models, maps, and handouts. It provides guidelines for effective use of each aid. Blackboards should be kept clean and writing should be large enough to see from all parts of the room. Bulletin boards require organized, dated materials that are changed frequently. Charts are useful for presenting relationships and abstract concepts visually. Models, maps, and other three-dimensional materials help simplify and concretize ideas. Handouts provide information to supplement lessons.