Discrimination - learning behavior of children is analyzed in terms of two theoretical orientaitons: the mediational - attention conception, and a coordinated single-unit and mediational S-R formulation. The influence of verbal labels and other symbolic representational responses is discussed. (NH)

Discusses the need for a sustained and systematic effort toward establishing a theoretical framework for educational simulations, proposes the adaptation of models borrowed from the natural and applied sciences, and describes three simulations based on such a model adapted using Brunerian learning theory. Sixteen references are listed. (LLS)

Discussion about the nature and varieties of mathematical understanding is presented. Symbolic understanding is defined as a mutual assimilation between a symbol system and a conceptual structure, that is dominated by the conceptual structure. (MP)