Explored is the role of thought experiments in the development of physical theories. Drawing examples from quantum theory it asks how a method that generates no new empirical data can nonetheless exert an influence upon a subject defined by its empiricism. (Author/KR)

Examines quantitative models in school physics, looking particularly at the degree to which they match the real world. Explores the positive aspects of a mismatch between models and real world conditions. (DDR)

Describes the characteristics of task-centered explorations. Provides definitions and examples of types of task-centered activities. Analyzes factors which produce an uneven distribution pattern in the type of explorations that pupils experience. Discusses the implication of these analyses for classroom teachers. (CW)