Ron Gray

The Structure of Scientific Arguments by Secondary Science Teachers: Comparison of experimental and historical science topics

Just as scientific knowledge is constructed using distinct modes of inquiry (e.g. experimental or historical), arguments constructed during science instruction may vary depending on the mode of inquiry underlying the topic. The purpose of this study was to examine whether and how secondary science teachers construct scientific arguments during instruction differently for topics that rely on experimental or historical modes of inquiry. Four experienced high-school science teachers were observed daily during instructional units for both experimental and historical science topics. The main data sources include classroom observations and teacher interviews. The arguments were analyzed using Toulmins argumentation pattern revealing specific patterns of arguments in teaching topics relying on these 2 modes of scientific inquiry. The teachers presented arguments to their students that were rather simple in structure but relatively authentic to the 2 different modes. The teachers used far more evidence in teaching topics based on historical inquiry than topics based on experimental inquiry. However, the differences were implicit in their teaching. Furthermore, their arguments did not portray the dynamic nature of science. Very few rebuttals or qualifiers were provided as the teachers were presenting their claims as if the data led straightforward to the claim. Implications for classroom practice and research are discussed.

Talking modelling: examining secondary science teachers’ modelling-related talk during a model-based inquiry unit

ABSTRACT This study examines the classroom talk about models and modelling of two secondary science teachers implementing a model-based inquiry instructional unit. The goal was to better understand the opportunities for explicit metamodeling talk in the science classroom. The findings revealed the ways in which they used language to frame the modelling work of the classroom. Instances of modelling talk were identified in classroom videos, and coded using a framework for metamodeling knowledge. Findings revealed that, while instances of metamodeling talk were common, they were largely implicit. This shows that the teachers were aware and knowledgeable about metamodeling ideas (e.g. the nature of models, process of modelling, etc.), but often did not make these ideas explicit to their students. Such findings suggest a trend of focusing on models of phenomena rather than supporting student engagement in the epistemic practice of modelling for reasoning about phenomena. The findings also revealed specific opportunities for explicit metamodeling talk by the teachers including during share-out sessions and the negotiation of explanation criteria. Further implications for classroom practice and research are discussed.