Analyses highlighting the epistemic dimension of students' participation in science have dominated science education literature for the past several years. While most of this literature has focused on how students learn together, the relational nature of these knowledge-building interactions has been under-examined. In response, this paper…

Generalization is a critical component of mathematical reasoning, with researchers recommending that it be central to education at all grade levels. However, research on students' generalizing reveals pervasive difficulties in creating and expressing general statements, which underscores the need to better understand the processes that can support…

In this paper, we present data from two iterative teaching experiments involving students' constructions of four basic counting problems. The teaching experiments were designed to leverage the generalizing activities of relating and extending to provide students with opportunities to reflect on initial combinatorial activity when constructing…

Developing a sound ability of noticing is a crucial competency for both teachers and medical professionals in the respective professional and disciplinary communities. In this article, we investigate noticing in practice--how members of a professional community in the high-tech modern medicine specialty of Advanced Heart Failure use this ability…

This article reports a validity study of History Assessments of Thinking (HATs), which are short, constructed-response assessments of historical thinking. In particular, this study focuses on aspects of cognitive validity, which is an examination of whether assessments tap the intended constructs. Think-aloud interviews with 26 high school…

As scientific models of student thinking, learning progressions (LPs) have been evaluated in terms of one important, but limited, criterion: fit to empirical data. We argue that LPs are not empirically adequate, largely because they rely on problematic assumptions of theory-like coherence in students' thinking. Through an empirical investigation…

To identify expert poets' cognitive processes as they compose poetry, we asked 10 expert poets and 10 novice writers of poetry to think aloud as they composed a poem. Compared to the novices, expert poets revealed an associative playfulness and surrendering of consciousness, similar to that shown in research on general creativity in domains such…

In this article, we provide a novel view of mathematics learning disability (MLD) by studying a student with an MLD (Dylan) who had compensated so effectively that she was able to major in statistics. We push back on the dominant deficit model used in studies of MLD, and consider issues of access and compensation from a Vygotskian theoretical…