Abstract
This investigation was designed in conjunction with the study conducted by Paquette (1971) to test the effects of varying referent triangle-pair configurations (where the instruction was mediated by an IBM 1500 Instructional System) on the achievement of selected instructional objectives related to the study of congruent triangles. The configuration classification (CC) matrix, as described in Figure 1 of the article by Heimer and Lottes, was used to generate and classify all congruent triangle-pair referents employed in this study. The primary purpose of the study was concerned with selected effects of multiconfiguration instructional treatments, as defined below, on the achievement of instructional objectives over collections of configuration classes for which instruction was not provided.
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