Significant improvement in American science education is desirable from many perspectives. This need can be encapsulated in the student learning goal of flexible, inquiry-based problem solving. To guide efforts to move towards this goal, an Amalgamated Model of science education is synthesized from six major trends in science education. Explication of this model is focused on the physical sciences, as is the research carried out to test one of the predictions of the Model. One keystone of the Amalgamated Model is the delineation and characterization of concepts according to the three properties of generality, complexity, and abstractness. Using these three properties, a conceptual structure for physical science is constructed. When this structure is compared with conventional physical science curricula, a large discrepancy is in the treatment of the conservation of energy concept. The Model predicts that elementary and middle school age children develop intuitive understandings of the concept, whereas conventionally it is believed to be inherently difficult and comprehensible only to older, high school students. To test this prediction, two sets of tasks and associated clinical interviews are administered to 48 subjects randomly drawn from a K-6 population. The first set of tasks consists of the classical Piagetian conservation instances and the second set investigates understanding of conservation of energy. The quantitative data generated by the two tasks is analyzed to measure the degree of connection within subjects\u27 conceptual structures between their ability to conserve quantity, substance, weight and volume and their ability to conserve energy. The results indicated that understanding of conservation of energy is connected to and apparently develops from the understandings of Piagetian conservation. The experimental and analytical methodologies could be used for further mapping of conceptual structures. It would seem that the prediction of the Amalgamated Model cannot be rejected as false, providing some justification for using the Model as a future framework for research in conceptual structures and for science curriculum development
