This quasi-experimental study investigated the effects on 558 grades five and six students of three different teaching conditions: the "classical" model of conceptual change (for which cognitive conflict is considered as a precondition to the transformation of knowledge), the "prevalence" model of conceptual change (in which…

Science educators are confronted with the challenge to accommodate in their classes an increasing cultural and linguistic diversity that results from globalization. Challenged by the call to work towards valuing and keeping this diversity in the face of the canonical nature of school science discourse, we propose a new way of thinking about and…

Some ability to comprehend deep time is a prerequisite for understanding macroevolution. This study examines students' knowledge of deep time in the context of seven major historical and evolutionary events (e.g., the age of the Earth, the emergence of life, the appearance of a pre-modern human, "Homo habilis"). The subjects were 126…

Argues that "truth" and "time" are defined differently by scientists and postmodern observers of science: a theoretical definition of "truth" is often applied to scientific knowledge within science education, whereas a practical definition, supported by evidence, is used within science. (Author/CCM)

Data from 60 observations of 10 teachers and 10 each of their students showed that type/quality of teaching strategy predicted 37 percent of variance in engagement and that the more indirect the teaching strategy, the greater the students' involvement in learning tasks. Implications of these and other findings are discussed. (Author/JN)

Examined management behaviors of junior high science teachers (N=16) and the relationship to task involvement of students operating in small group laboratory settings. Results of 91 observations indicate that teacher behavior was directed in three ways: whole class, small groups, and nonclass related. Implications for science instruction are…

Results of modifying mastery learning strategy to two diagnostic cycles with high school chemistry students (N=156) indicated that achievement of mastery learning students was significantly greater than that on nonmastery learning students. Attitudes toward science/science instruction were not significantly different but were positive in both…

Results of 11 studies of classroom practices used with activity-based elementary science programs were combined quantitatively using a composite category system. One finding reported is that teachers trained in program use spent less time talking and more on activities than untrained teachers using the programs. (Author/JM)

Examined relationships between teaching behaviors and student engagement in 13 middle school science classes. Results indicated that seven managerial variables and four instructional variables were significantly related to student engagement rates. Types of tasks allocated by teachers were also significantly related to types of tasks undertaken by…

Investigated effects of limited oral/physical teacher intervention on object manipulation by preschool/early elementary children (N=70). Experimental students had magnets placed in their hands and were orally invited to explore. Results indicated differences between experimental/control groups in time spent with objects, number of activities…

Examined effects of teaching method (self-directed, group-directed, teacher-directed), academic ability, student assessment of treatment, and allowed time on achievement in three Individualized Science Instructional System (ISIS) biology minicourses. Results, among others, indicated that individualized instruction favored high-ability students and…