This monograph is a compilation of the knowledge gained by the Technical Assistance Center (TAC) of the Helen Keller National Center, from training and technical assistance activities conducted with state interagency teams serving youth and young adults with deaf-blindness. The book views interagency collaboration as essential in achieving community-integrated education, employment, and living outcomes for youth with deaf-blindness. Chapter 1 describes the purpose, benefits, design, and outcomes of the "cohort" training and technical assistance approach TAC uses with state teams. This approach involves training four to six state interagency teams during an intensive 2-3 day workshop, followed by specific and individualized technical assistance training activities for each state team. Chapter 2 focuses on the interagency collaborative process--what it means; what it entails; and the necessity of shared vision, interdependence of stakeholders, leadership, and communication. In Chapter 3, the salient aspects of a successful interagency process are discussed, with examples from several state teams in various evolutionary stages of the process. The development of a philosophy statement, the goal-setting process, the individual case study approach, parent involvement, interagency team-building and empowerment, and structural procedures are discussed. Chapter 4 discusses in more depth the critical component of parent involvement in the interagency team process. Chapter 5 presents strategies for identifying interagency problems and resolutions, facilitating group decision-making, and reaching consensus. Chapter 6 summarizes the critical points discussed in the preceding chapters. Appendices contain examples of state interagency team action plans, as well as structural procedures and guidelines for state interagency teams. (16 references) (JDD)