Using the ECLS-K and considering first graders in single-grade and K-1 and 1-2 combination classes, I discuss the mechanisms underlying the combination-class effect and address the systematic school-, teacher-, and student-level differences that confound estimates of this effect. I find evidence for positive selection into 1-2 classes, but using a…

This article describes a multiage classroom led by three co-teachers who facilitate the education of 42 students ages six through nine years. The classroom is located in a public school district that practices inclusion and subscribes to the principles of whole schooling. A literature review defines the concepts of co-teaching, multiage education,…