The paper critically appraises the concept-learning and developmental perspectives in science education to show that Pascual-Leone's Theory of Constructive Operators leads to a progressive problem-shift between Piaget's epistemic subject and Pascual-Leone's metasubject. (SM)

Examines the mathematical process used by students when solving physics tasks that require proportional reasoning. Investigates students' understandings and explanations of their mathematical processes. (Author/CCM)

Introduces an inquiry-based lab design in which students try to find evidence on a particular problem. Investigates the effects of decreases in the pH level on the environment. Includes students' hypotheses and research results. (YDS)

Suggests that models and theories in physics exist for a particular phenomenon, and that these models could be organized to explain the entire physics domain. Describes the knowledge structures of experts, intermediates, and novices and compares the proportions of theory and model-based categories created by the subjects. Investigates the…

Investigates interactive processes among group partners and the relationship of these processes to problem-solving outcomes in two contrasting groups. Identifies three major contrastive dimensions in group interaction: (1) he mutuality of exchanges; (2) the achievement of joint attentional engagement; and (3) the alignment of group members' goals…

Explains Occam's razor which is a guiding principle in scientific methodology. Describes a genetics problem to demonstrate Occam's razor. (YDS)

Identifies the misunderstandings and problem-solving strategies of secondary students when solving stoichiometry problems. (Author/CCM)

Explains what successful scaffolding requires and discusses three problems that teachers have when using scaffolding. (YDS)

Explains modeling as a teaching approach and presents two examples of modeling, one example of poor modeling and one example of good modeling. (YDS)

Introduces the Global Positioning System (GPS) and explains its use in the science classroom. (YDS)

Describes a format for teaching a large introductory biology course that encourages student preparation prior to class and utilizes problem solving instead of lecturing. (Author/MM)

Describes the different types of scientific calculators and explains how graphic calculators can apply to chemical problems. (Contains 19 references.) (YDS)

Explains how three fundamental ideas in chemistry--the mole, the periodic table, and quantum numbers--should be introduced to students for better student understanding. (YDS)

Basic data collection can be used to provide information on what kind of teaching strategies can be used to teach students who are solving chemistry problems. Recommends using lesson scripts that challenge students to find the right answer. (Contains 35 references.) (YDS)

Application of quadratic equations to standard problem in chemistry like finding equilibrium concentrations of ions in an acid solution is explained. This clearly shows that pure mathematical analysis has meaningful applications in other areas as well.