This training manual and two companion videotapes comprise an educational program for professionals and paraprofessionals who work with young children with language disorders. The program is particularly helpful in serving children from linguistic minority backgrounds and their families. The program's strategies are also appropriate for teachers and parents of children in the 2- to 4-year-old range who are developing typically. The "Language Is Key" model draws upon three solid research bases: early language is critical to later academic success; parents can use simple language facilitation strategies after brief training; and strengthening a child's first language--the language spoken at home--will also support the development of English. Following an introduction, the manual presents brief descriptions of the program's recommendations to train staff to use language strategies with children, train staff to train parents/families, and train parents/families. The third section details the program's conceptual framework and the three language facilitation strategies: Comment and wait; Ask questions and wait; and Respond by adding a little more (CAR). The fourth and fifth sections of the manual outline specific agendas for six training sessions for staff and for families, respectively, and provide important support for the content in the videotapes. The final section of the manual lists references and resources. Background information for trainers and reproducible handouts for each training session are appended. The two companion videotapes provide specific language building strategies that will enhance typical early childhood classroom routines and parent-child interactions. The first videotape shows how parents and teachers can facilitate children's language while looking at picture books; the second focuses on language facilitation during play. (HTH)