The family is at the core of early intervention. In line with family-centered practice, when early intervention supports and services are based on what the family considers to be important, positive outcomes for the family as well as the child are experienced. Prior research confirms the benefits of early intervention for the family in general. Studies have been conducted employing the perspective of the parent in reporting positive impacts of early intervention on families. No studies, however, were found in the literature to indicate what specific impacts parents perceive of early intervention on family functions, and how family functions are influenced by early intervention. The purpose of this study was to understand the impact that parents perceived of early intervention on five areas of family functions: daily care, spirituality, socialization, recreation, and self-esteem. Using a collective case study design, four families that had previously received services through Part C of the reauthorization of the Individuals with Disabilities Education Act (IDEA, 1997) for at least two years, participated in the study. Data were collected through semi-structured interviews with parents, review of Individual Family Service Plans, and observations of the family during three visits to their homes. Results indicated that parents did feel that early intervention had impacted family functions, especially in the area of self-esteem. Through accounts of their experiences, parents also validated the positive impact of the use of family-centered practices. Findings of this study provide important implications for potential impact of early intervention on family functions. [The dissertation citations contained here are published with the permission of ProQuest LLC. Further reproduction is prohibited without permission. Copies of dissertations may be obtained by Telephone (800) 1-800-521-0600. Web page: http://www.proquest.com.bibliotheek.ehb.be/en-US/products/dissertations/individuals.shtml.]