Abstract
This study was designed to investigate the instructional effectiveness of eight types of visual illustrations used to complement oral instruction. Tenth grade students received identical oral presentations and viewed their respective visual treatments for equal amounts of time. Students were randomly assigned by class to treatment groups, received a pretest, participated in their respective instructional presentation and received four individual criterial measures. Results indicated that the use of visual illustrations to complement oral instruction is an effective way of increasing student achievement on the criterial tests. The analysis also indicated that some types of visuals are more effective than others in facilitating student achievement of specific educational objectives.

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