Research is clear – high-quality preschool can change the educational trajectories of young children and influence their lifetime achievement and well-being. Improvements in children’s kindergarten readiness lead to increased achievement and school success with such benefits as increased earnings that continue for a lifetime. New Jersey’s former Abbott preschool program is proven effective and regularly highlighted as a model for the nation. For these reasons, Governor Phil Murphy has proposed expansion of full-day, high-quality preschool to all three- and four-year-old children in the state. (author abstract)