Project Validation of the Intervener Program (VIP) studied and documented the effectiveness of the Intervener Service Model which provides the services of a paraprofessional (called an intervener) to families of young children who are deaf-blind. The intervener provides auditory, visual, and tactile stimulation for the child and helps the child develop interactive behaviors instead of isolated, defensive, or self-stimulatory behaviors. The intervener also enables the parents to obtain much needed respite. Project VIP obtained abundant quantitative and qualitative data on the effectiveness of the Intervener Service Model. The data strongly support the need for Intervener Services for young children who are deaf-blind and their families.