Empirical evidence that horizontal alignment of policies and practices from preschool through the early elementary grades sustains the effects of quality preschool and contributes to children's learning is scarce, as discussed above, but there are nevertheless good reasons to expect benefits to such alignment. Moreover, many districts and schools…

"PreK-3 Alignment in California's Education System: Obstacles and Opportunities" by Rachel Valentino and Deborah J. Stipek reviews the opportunities and challenges that must be addressed to better align PreK-3 education in California. The report describes policies and practices that districts have implemented to strengthen alignment, and…