Discussion of stereoscopic and planoscopic diagrams as they relate to the level of understanding in depth relationships. Findings indicate a significantly lower understanding in stereoscopic diagrams when compared to a real three-dimensional situation. (JEG)

Reviews study of undergraduates which evaluated the effects that variations in depth of information processing have on students' memory systems in terms of their ability to acquire and retrieve information related to different types of instructional objectives. The effect of visual versus verbal testing of visualized instruction is also examined.…