The document discusses the trend of transitioning elementary school students to departmentalized classes, where core subjects are taught by different specialized teachers. This trend is partly due to pressure from high-stakes testing required by the No Child Left Behind Act. While departmentalization allows for greater subject depth and helps distribute accountability, younger students may not be developmentally ready and benefit more from a nurturing environment in self-contained classrooms. The ideal time to transition may be in the last grade before middle school.