When every child has the opportunity to meet his or her full potential, families, communities, and the nation's economic future strengthens. Remarkably, one in four American children come from low-income families and enter kindergarten not ready to learn and, as a result, fall behind from the very start. The nation pays a heavy price through…

Reported here are the results of analyses to describe the patterns of identification and academic and developmental outcomes for children with disabilities, conducted as part of the 2004 National Assessment of the implementation of the Individuals with Disabilities Education Act (IDEA). This report provides background context for National…

This article introduces a multilevel growth mixture model (MGMM) for classifying both the individuals and the groups they are nested in. Nine variations of the general model are described that differ in terms of categorical and continuous latent variable specification within and between groups. An application in the context of school effectiveness…