This report is part of a series prepared for planning and developing a comprehensive, coordinated service delivery system for Arizona infants and toddlers who are developmentally delayed or at risk of developing handicapping conditions, and their families. It identifies Arizona agencies designated to respond to the special needs of young children and their families. State-level agencies and programs included are the Department of Economic Security, Department of Health Services, Department of Insurance, Health Care Cost Containment System, State Board of Education, State School for the Deaf and Blind, Office of the Governor, Council for the Hearing Impaired, Center for Law in the Public Interest, and Head Start. The United States Social Security Administration is also described. The content for each agency consists of: mission statement, administrative structure, eligibility requirements, services offered, interagency coordination efforts, federal and state laws and regulations governing the agency, source of programmatic funding, and advisory councils. A section of recommendations outlines implications of the policy analysis for implementing early intervention services. A 49-item reference list, a list of federal and Arizona laws, and the text of Part H, Section 672, of Public Law 99-457 conclude the document. (JDD)