In the United States, for typically developing children, age has historically been the most common factor determining when a child starts formal schooling. Recently, there has been increased emphasis on other indicators of being ready for school. Beginning with Head Start in 1965 and mushrooming into state-funded prekindergarten programs in most…

The "Building Blocks PreK Math Curriculum" (Clements & Sarama, 2007) was designed to facilitate children's engagement in math and talk about math. Much research investigates the effect of curriculum on classrooms or teacher practices. This study used a mediational model to look at a curriculum's effect on children's achievement gain, operating…