G. L. Anderson reported finding an interaction between drill and meaningful methods of instruction with fourth grade student ability and achievement. The reanalysis overturns Anderson's conclusion that there is an aptitude treatment interaction within classes. (BJG)

This document focuses on how research which investigates the interaction between learning abilities and instructional treatments (Aptitude Treatment Interaction or ATI) should proceed. Previous research related to ATI is evaluated in the context of the ATI premise that characteristics of learners affect their attainment of educational goals…

Alternative ways of analyzing data from Aptitude Treatment Interactions were examined over a two-year period. In light of past arguments the author maintains that the questions surrounding aggregation have been badly posed and that the customary methods of analysis were either incorrect or subject to misinterpretation. Therefore, the majority of…