Process and product are always in tension. In authentic writing, they can be messy and hard to assess. Because writing is recursive and generative, every word written opens new possibilities. Not only that, but writing is influenced by ability, time allowed, task definition, rhetorical situation, relationship to reading, and helpful thinking…

The handling of mistakes in the mathematics classroom is an area in which only little research is done so far. In mathematics education there are, in fact, several investigations about students' mistakes from a diagnostic perspective, but hardly any studies on the question how teachers react in concrete mathematics lessons. In this article…