The authors point to systemic-theoretical instruction (STI), which underscores the importance of abstract conceptual knowledge in schooling, and dynamic assessment (DA), in which mediators and learners function cooperatively, as examples of the theory-practice relation envisioned by Vygotsky (1987). This article proposes an interactional framework…

Induction refers to categorizing sensory experience and substitution to interchanging similar objects. If similar items are functionally identical and near the focus of attention at nearly the same time, similarity impedes learning (interference). If either condition is not fulfilled, similarity aids learning (transfer). (DD)