I'his chapter provides a revie'.'l and discuss i c:::>n of issues related to interactions among independent variables and their e f:ect on dependent variables in learning situations. Interaction is present.. -vvhenever an effect holds for one kind of sub.ject under one set of conditions "1:::>u.t does not hold in the same ivay for other types of subjects or other sets of' conditions. Wnen interaction hypotheses guide research on inst.ruction the res E':arch enterprise is altered.
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Berliner et al. (1972) studied this question.
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