This report is the final in a series designed to assist in the planning and development of 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, as outlined in Public Law 99-457. It documents the needs of Arizona's families as identified by a statewide, representative sample of 536 parents and caregivers who were interviewed concerning their involvement in meeting their child's needs, the nature and type of services they were receiving, their satisfaction with the services, their need for other services, financial needs, information needs, and emotional support needs. Services evaluated include medical, rehabilitative, educational, family programs, and low-income family services. The report offers a profile of the sample, summarizes interview responses, and identifies unique needs of different ethnic groups and of rural versus urban residents. An executive summary discusses four conclusions specific to financially stable families, families with low incomes who are not Arizona Health Care Cost Containment System (AHCCS) recipients, minority families, and AHCCS recipient families, and offers one conclusion concerning all families. An appendix describes the project design, sample, methodology, and analysis. (JDD)