Argumentation has become an increasingly recognized focus for science instruction---as a learning process, as an outcome associated with the appropriation of scientific discourse, and as a window onto the epistemic work of science. Only a small set of theoretical conceptualizations of argumentation have been deployed and investigated in science education, however, while a plethora of conceptualizations have been developed in the interdisciplinary fields associated with science studies and the learning sciences. This paper attempts to review a range of such theoretical conceptualizations of
Educators in informal science are exploring data visualization as a way to involve learners in analyzing and interpreting data. However, designing visualizations of data for learners can be challenging, especially when the visualizations show more than one type of data. The Ainsworth three-part DeFT framework can help practitioners design multiple external representations to support learning.