This introductory packet discusses early development and learning, and summarizes the research base for early childhood interventions. The packet also examines implications for school readiness, identifies good practice to promote healthy early development and address barriers, and presents resources and references. The packet's introductory section highlights a perspective for addressing barriers to learning; this perspective stresses the importance of developing a continuum of interventions that comprise a comprehensive, multifaceted, and cohesive approach. Section 2 of the packet details the burgeoning interest in infant and child development, identifies developmental milestones, and discusses the importance of screening for problems. Section 3 outlines key lessons related to early experience and brain development for parents and child caregivers. Section 4 summarizes the research base for early childhood interventions, including risk and protective factors for young children and the studies examining the impact of early childhood programs. Section 5 examines implications of research on intervention effects for school readiness, discussing the concept of school readiness, the potential of families for promoting readiness, Head Start, and school involvement in early childhood. Section 6 highlights guidelines and principles for good practices to promote healthy development, identifies specific models and programs, and discusses policies and initiatives to promote child development. Section 7 presents resources and references in the areas of: (1) early child development; (2) brain development; (3) early childhood mental health research and programs; (4) early childhood education and child care; (5) parenting; (6) resources available through ERIC; (7) related agencies and organizations; and (8) materials developed by the Mental Health in Schools Training and Technical Assistance Center. Most sections contain references. (KB)