This study sought to assess the social validity of "It Takes Two to Talk (ITTT)"®--the Hanen Program for parents, delivered to families of children with language delays in Valencia, Spain. Social validity was assessed using a multi-method approach--questionnaires (filled out by the parents) and a focus group--at different times during the program and at follow-up. The acceptability of the procedures used in ITTT® was positive in terms of the program format and the didactic resources used, such as the video-recordings of the parent-child interactions. Parents also expressed their overall satisfaction with the results regarding changes in their communication style and the advances observed in their child's language development. However, some suggestions were made to better meet the families' needs related to the length of the program and distribution of the contents, the time devoted to individual training, and the adaptation to the context.