What Is Pre-K To Grade 3?

“American public policy has to shift to acknowledge that the core skills
needed for success in life are formed before children enter school.”
- James Heckman, Nobel prize-winning economist

In short, Preschool to Grade 3 (PK-3) is an attempt to bridge the gaps between early childhood programs and primary schools.
Reynolds, Magnuson & Ou (2010) define PK-3 programs as "planned interventions that begin during any year of a child's life before kindergarten and which continue up to third grade" (p. 1122).