Dr. Katherine McNeill will present on recent reform documents and research including a focus on argumentation, making the case that students should be able to construct and defend their claims using evidence as well as critique arguments presented by others. Also to engage students in argumentation, teachers themselves need support to develop new knowledge and teaching skills. Educative curriculum materials offer one potential avenue for support; however, creating these resources is challenging, and numerous external and internal factors cause teachers to enact curricula in different ways. To better support teachers' curriculum enactments, we need to understand teachers' decision making around scientific argumentation. The title of her talk is: Teachers’ scientific argumentation instruction: Factors that impact instructional practices during a curriculum enactment.