Examines methods and types of estimation. Characterizes fruitful in-class estimation tasks by exploring the validity and possible extensions of "marble jar" estimation. (KHR)

Presents an activity using similar rectangles to help children conceptualize ratio relationships in several different ways. Develops proportional reasoning without introducing the process of cross- multiplication. (YDS)

Describes a study on how effective teachers use manipulatives successfully. Presents factors to recognize when manipulative-based lessons are identified and discusses ways in which the use of manipulatives can go astray. (YDS)

Considers the translation from Latin of Newton's First Law (NFL) in an historical perspective. Shows that Newton's original yields two versions of complimentary meanings, one temporal and the other quantitative. Reviews the presentation of NFL in physics textbooks and notes a decline in the status of NFL in the physics curriculum. (Contains 72…

Studies misconceptions held by grade 9 students (14-15-years old) in Turkey about photosynthesis and plant nutrition. Uses a questionnaire to test students' conceptions and reports conflicting and often incorrect ideas about photosynthesis, respiration, and energy flow in plants. Suggests that there are difficulties in changing students' prior…

Identifies the types of questions that students ask during science learning. Explicates the role of students' questions in the knowledge construction process, particularly in educational discourse. Investigates the relationship between students' questions and approaches to learning and discusses some emergent issues related to student questioning.…

Describes an approach to teaching complex models in science that uses a model construction cycle of generation, evaluation, and modification. Reports on a case study of a student in a tutoring experiment in the study of electric circuits. Focuses on the role of analogies, discrepant events, and the student's moments of surprise as motivators of…

Compares junior high school students' conceptual changes about force and motion and their interest in science between a group whose instruction including sports experiential learning activities and a group who used traditional instruction. Examines students' conceptual changes and interests according to the degree of their sports experience before…

Undertakes, from a poststructuralist perspective, a meta-analysis of two short episodes from a paper by Manouchehri and Goodman (2000). Explores how mathematical knowledge and identities are produced in teaching/learning interactions in the classroom and the wider practical implications of this productive power of process for mathematics education…

Describes a study investigating the effects of short-term interventions on preservice elementary teachers' understanding of the topic of ozone depletion and whether complex issues can be dealt with successfully through short-term intervention. Reports that preservice teachers' understanding improved through a short-term intervention using a mix of…

Reviews research on the appropriateness of computer use with young children. Discusses the effects computer use on children's lives, interaction, social and emotional development, learning and thinking in mathematics, and the implications for teachers. (KHR)

Investigates primary students' conceptions of acid rain formation and its consequences to people and the environment before and after a 10-hour constructivist teaching intervention. Reports improvement in conceptions of physical and chemical phenomena among the experimental group participants. (Contains 23 references.) (Author/YDS)

An adult male with mild mental retardation had previously been trained in a match-to-sample task on 16 arbitrary relations among 16 visual stimuli and 2 auditory stimuli. Testing indicated the development of 112 additional arbitrary relations that had never been reinforced. On two-year and three-year followup, his performances remained stable.…

The role of subject verbalization in the generalization of verbal-nonverbal correspondence was investigated in 12 kindergarten children who underwent either correspondence training (subject verbalization) or performing a behavior verbalized by the experimenter. Pupils who received correspondence training demonstrated greater generalization.…

Suggests a videotape illustration is highly effective in teaching Kelley's covariation attribution model. Notes the use of videotapes improves the students' understanding of attribution concepts. Claims students are able to make appropriate attributions using Kelley's model and to apply them to real-life situations. (Author/NL)