This September 2010 article is a reprint of the original October 1998 article. Few reform initiatives focus on what goes on in the "black box" of the classroom, on what really happens in the interaction between teachers and students. This article is about the inside of the black box. The authors focus on one aspect of teaching: formative…

Firm evidence shows that formative assessment is an essential ingredient of classroom work and that its development can raise achievement standards. Achieving this goal demands a four-point scheme for teacher development: learning from development, a slow, yet steady dissemination process, reduction of obstacles, and substantive research efforts.…

In their widely read article "Inside the Black Box," the authors demonstrated that improving formative assessment raises student achievement. Now in this article, they and their colleagues report on a follow-up project that has helped teachers change their practice and students change their behavior so that everyone shares responsibility…