Cointervention is a process in which parents collaborate with professionals to implement an intervention with young children. This article describes the use of naturalistic language teaching procedures by parents as an example of cointervention. Research with parents of young children who have disabilities has shown that teaching parents strategies for supporting language and communication results in changes in child language skills, in parent interaction strategies, and in the quality of the parent-child relationship. Factors to be considered in choosing cointervention as an early intervention model are discussed.