For decades, researchers have studied student achievement gaps in many countries. This article posits that a similar learning gap may be occurring among the organizations we call school systems--a potential gap between school systems that have maintained the status quo and those that have been working to innovate and improve. The case study…

Although teacher learning and collaboration are repeatedly linked to school improvement, surprisingly little is known about the facet of collaboration involving the dissemination or sharing of teacher knowledge; that is, what teachers share, why and with whom they share it, or how and when they share what they have learned. This article describes…