Gagne's learning-hierarchy model and the model-testing procedures used in empirical investigations of the model are reviewed. Structural modeling techniques based on path analysis are suggested to represent Gagne's positive transfer hypothesis and associated hypotheses. Implications of structural modeling techniques for research in hierarchical…

Studies in the role of play in child development are classified in terms of their major correlates or dependent variables: (1) creativity, (2) problem solving, (3) language development, (4) logical skills, and (5) social knowledge. Study designs are critically examined, and internal and external validity problems are noted. (Author/PN)

Developmental assumptions that are frequently regarded as constraints on elementary school science curricula are analyzed. The argument that elementary school children cannot function as experimentalists because they have not yet attained formal operational thought is not supported by the Piagetian or non-Piagetian research reviewed. (SLD)

Research indicates that classroom controversy facilitates student problem solving, creativity, perspective taking, epistemic curiosity, conceptual conflict, and transition in stages of cognitive and moral reasoning. Thus, creating controversy is an important teaching strategy for increasing learning and intellectual development. Conditions…