Abstract
The general objective of the experiment was to investigate the claim that instruction in geom etry which emphasizes visualization and appli cation by the use of sound motion pictures or films trips is more efficacious in promoting learning than instruction which uses other sup plementary aids. Specifically, this study evalu ated experimentally the relative effectiveness of certain audio-visual aids as contrasted with con ventional instruction on (1) informational learn ing, (2) development of fundamental skills, (3) ability to make applications of geometric principles and facts, and (4) retention of these types of learning. Wherever the audio-visual aids were used in experimental classes, they replaced an equivalent amount, in time, of con ventional instruction.
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