Similar content has tremendous utility in classroom and online learning environments. For example, similar content can be used to combat cheating, track students' learning over time, and model students' latent knowledge. These different use cases for similar content all rely on different notions of similarity, which make it difficult to determine…

Pre-service science teachers' conceptual understanding of astronomical concepts and their misconceptions in these concepts is crucial to study since they will teach these subjects in middle schools after becoming teachers. This study aimed to explore both seventh-grade students' and the science teachers' understanding of astronomical concepts and…

The e-rater® system has been used by ETS for automated essay scoring since 1999. This paper describes a new version of e-rater (v.2.0) that differs from the previous one (v.1.3) with regard to the feature set and model building approach. The paper describes the new version, compares the new and previous versions in terms of performance, and…