Based on the analysis of available research on students' alternative conceptions about the particulate nature of matter, we identified basic implicit assumptions that seem to constrain students' ideas and reasoning on this topic at various learning stages. Although many of these assumptions are interrelated, some of them seem to change or…

Two questionnaires were given to 38 students (16-18 year olds), in which they were asked to classify a list of different conceptual entities by several ontological features. The results suggest the form of a fundamental "ontological space" and locate some scientific concepts in this space. (Author)

Examined are first-year medical students' (n=160) explanations of complex concepts in cardiopulmonary physiology following a lecture series. The results revealed systematic misconceptions by the students in developing a pathophysiological model of the problem. The implications for science instruction within a medical curriculum are discussed.…

Identifies and describes the problems students have with the concept of neutralization. Analysis of over 7,500 students' answers to test questions over neutralization showed that many students understand the concept in its original meaning. Students assumed that in any neutralization reaction a neutral solution is formed, even if a weak acid or…

The testing of a formal causal model of thinking about motion is described using a matching-pairs paper-and-pencil task. Subjects were asked to distinguish between examples of stereotypical motions by the similarity or difference of causes of pairs of motions. The results suggest that responses can be predicted by the model with the addition of an…

Experiences with an instructional strategy which enabled students to build for themselves the appropriate scientific concept for energy are described. This was done by pupil/teacher dialogue in small groups, in which students were expected to create for themselves a "generalization mechanism" based on their own frameworks. (KR)

Describes a study of a range of challenging activities centered on evaporation and condensation done with elementary school children. Analyzes children's explanations in light of the existing literature. Finds that older children display a surer sense of ontological categories, greater epistemological sophistication, greater precision in language…

Describes children's conceptions of the structure and function of the human digestive system based on an investigation carried out with children aged 4-10 (n=45). Finds that children possess biological knowledge as an independent knowledge domain from the age of four. Discusses acquisition of and barriers to scientific concepts related to human…

Analysis of data on children's ideas about seeing and light is reported. Analysis is theoretically informed by Piagetian stage theory of genetic epistemology. Data produced by other researchers have been recoded to enable quantitative comparisons to be made with the survey data reported by Shayer and Adey (1981). Patterns in the data exposed by…

An investigation of students understandings of acids and bases using concept maps, multiple-choice tests, and clinical interviews is described. The methodology and resulting analysis are illustrated with two abbreviated case studies selected from the study. Discussion of concept mapping points to how it starkly represents gaps in the understanding…

Identifies the unsophisticated assumptions and conjectures, both intuitive and empirical in character, underlying secondary school science students' (n=25) portrayal of scientific knowledge and its production. Structured interview protocols explored not only the students' substantive knowledge base but, perhaps more important, their ability to…

Three modules on chemical equilibrium, developed as resource materials for a content-methodology course in chemistry for intending teachers and also for general chemistry courses at the senior secondary and tertiary levels, are described. The use of these modules in a methodology course showed a significant development of competence in the…

Investigates the relevance and concomitant impact of sociocultural experiences upon the scientific literacy of 87 students, aged 13 to 16, concerning their comprehension and assimilation of scientific data involving solar eclipses. Results indicate that the students' nonscientific conceptions about solar eclipses, generated through sociocultural…