Following a high-quality early care and pre-K experience, the kindergarten-through-third-grade years set the foundation upon which future learning builds; and strengthening this continuum creates opportunities for later success. Key components of a quality experience in K-3 include school readiness and transitions, kindergarten requirements, educator quality, prevention, intervention and assessments, and social and emotional learning and mental health. Education Commission of the States researched the policies and regulations that guide these key components in all 50 states to provide this resource and many others. The data in this document show that at least 37 states define and/or have a policy to address chronic absenteeism in statute or regulation. Definitions of chronic absenteeism typically include missing 10% or more of school days in a single school year. Policies to address chronic absenteeism include early warning systems that notify parents, referrals to community services and prosecution of parents for failing to ensure their children participate in school.