The Construction of Knowledge in Classroom Talk

Social interaction is important for the development of knowledge (M. Chapman, 1991 Chapman, M. 1991. “The epistemic triangle: Operative and communicative components of cognitive competence.”. In Criteria for competence: Controversies in the conceptualization and assessment of children's abilities Edited by: Chandler, M. and Chapman, M. 209–228. Hillsdale, NJ: Erlbaum.  [Google Scholar]). Social interaction, however, takes many forms, and J. Piaget (1977/1995) proposed that the construction of knowledge is facilitated in cooperative as opposed to constraining relationships. These views of knowledge development were drawn on in a study of classroom talk in higher education, namely in 2 first- and 2 fourth-year college and university psychology classes. Classroom talk was recorded, transcribed, and analyzed following conversation analytic (H. Sacks, 1992 Sacks, H. 1992. Lectures on conversation Vol. 1–2, Oxford, England: Basil Blackwell.  [Google Scholar]) and social pragmatic (W. Turnbull, 2003 Turnbull, W. 2003. Language in action: Psychological models of conversation. New York, NY: Psychology Press..  [Google Scholar]) approaches. Examination of how cooperation and constraint were constituted in the corpus was based on N. Mercer's (1995, 2000) categorization of different ways of making reasoning manifest, namely exploratory talk, or the joint negotiation of ideas; disputational talk, or the competitive negotiation of knowledge claims; and cumulative talk, or the uncritical addition of knowledge claims. Analysis focused on the sequential structures of classroom talk in and through which reasoning is achieved. Analysis revealed that most fourth-year talk was exploratory, whereas most first-year talk was disputational or cumulative.     

SCIS-II and the elementary teacher: A program evaluation

A two-part opinionaire was used to identify teachers' perceptions of the SCIS-II elementary science program. Of particular interest were perceived barriers to effective implementation of the program. The first part of the opinionaire was administered to 685 individuals, or 96.8% of the elementary teachers in a metropolitan school district. The second part was completed by a group of teachers at each grade level in each of the 31 elementary schools, with completion rates ranging from 77%–97% for the 13 SCIS-II units. Results indicate that grades K-2 teachers rated the program more positively than grades 3–6 teachers; teachers who rated the program highly perceived fewer barriers to effectively utilizing the program; and teachers rated the program higher for developing social skills and positive attitudes than for teaching science content and processes. Data on problems with individual SCIS-II units indicated that the viability and performance of the living organisms are problematic in all life science units. Further, the small number of insightful evaluative comments received for the last one-third to one-half of some units suggests that a significant portion of teachers are quitting the units before reaching the end.     

Preservice elementary teachers' conceptions of moon phases before and after instruction

This study focused on the conceptual understandings held by 78 preservice elementary teachers about moon phases, before and after instruction. Participants in the physics groups received instruction on moon phases in an inquiry‐based physics course; participants in the methods group received no instruction on moon phases. The instructive effect of two different types of preinstruction interviews also was compared. The instruction on moon phases used in the study is from Physics by Inquiry by Lillian McDermott. In the study, the method of inquiry followed a qualitative design, involving classroom observations, document analysis, and structured interviews. Inductive data analysis identified patterns and themes in the participants' conceptual understanding. Results indicate that without the instruction, most preservice teachers were likely to hold alternative conceptions on the cause of moon phases. Participants who had the instruction were much more likely to hold a scientific understanding after instruction. The instruction appears to be more effective in promoting a scientific understanding of moon phases than instruction previously reported in the literature. It also appears that using a three‐dimensional model or making two‐dimensional drawings during the preinstruction interviews does not have instructive value. © 2002 Wiley Periodicals, Inc. J Res Sci Teach 39: 633–658, 2002     

Predictors of ability-achievement discrepancies in children referred for psychoeducational evaluation

The present study evaluated a school district's psychoeducational screening program to determine the best predictors of two difference score variables: (a) WISC-R FSIQ – PIAT reading recognition score and (b) WISC-R FSIQ – PIAT math score. The study also investigated the merit of using scores from a group-administered achievement test (CAT) as predictors. Subjects were 61 first through fifth graders initially referred for testing from 1982–1984. Multiple regression analyses indicated: (a) for reading, the SIQ score and the PPVT-R – CAT reading difference score were significant predictors, together accounting for 27% of the variance, and (b) for math, the PPVT-R score accounted for 28% of the variance, with additional variables producing nonsignificant increments. Results suggest that CAT scores may prove useful predictors when combined with screening IQ tests to form difference scores.     

A longitudinal study of conceptual change: Preservice elementary teachers' conceptions of moon phases

This research consists of a longitudinal study of 12 female elementary preservice teachers' conceptual understanding over the course of several months. The context in which the participants received instruction was in an inquiry‐based physics course, and the targeted science content was the cause of moon phases. Qualitative research methods, including observations and interviews, were used to investigate and describe participants' conceptual understanding over time. Participants were interviewed on their understanding of the cause of moon phases before instruction, 3 weeks after instruction, and again in delayed post‐interviews several months after instruction. Patterns and themes in the participants' conceptual understanding were identified through constant‐comparative data analysis. Consistent with results reported earlier, participants who had instruction that included recording and analyzing moon observations over time and psychomotor modeling of changes in moon phases were very likely to hold a scientific conceptual understanding shortly after instruction. The present study indicates a majority of participants continued to hold a scientific understanding six months or more after instruction. However, some participants reverted to alternative conceptions they had shown during the pre‐interview. These results are interpreted utilizing contemporary conceptual change theory. © 2006 Wiley Periodicals, Inc. J Res Sci Teach 44: 303–326, 2007