Sourcing involves interrogating historical documents, asking questions about their attributes to determine their relation to the historical event or time period under study. In this article, a university researcher and a sixth-grade teacher describe a set of heuristics that the teacher developed for supporting her students' sourcing of historical…

Learning progressions (LPs) are theoretical models of how learners develop expertise in a domain over extended periods of time. Recent policy reports have touted LPs as a promising approach to aligning standards, curriculum, and assessment. However, the scholarship on LPs is relatively sparse, and the jury is still out on the theoretical and…