This guide describes ways in which partners at the state level can move toward more integrated and comprehensive support systems for children and families eligible for services under Part C of the Individuals with Disabilities Education Act. It reports on the collective experiences of states participating in the "Opening Doors Project," which was funded from 1993-1997 by the Maternal and Child Health Bureau. The purpose of the project was to design, synthesize, and disseminate recommended strategies for integrating services for Part C-eligible children and their families. Information was gathered through extensive reviews of state documents, focus groups, and direct interviews with families, service providers, and state and community-level administrators from six states (Florida, Hawaii, Maine, Missouri, Utah and Washington). Additionally, a nationwide survey was developed and administered to directors of 185 community-based Part C programs that served children and their families through home visits. This guide shares the information gleaned from this work and presents ideas for state interagency coordinating councils (SICCs) to consider as they carry out and refine their own state plans. (Contains 28 references and suggested readings.) (SG)