This guidebook is intended to assist the transition of Colorado students with developmental disabilities from school to post-school activities by promoting flexible and collaborative planning and service delivery among community-centered boards (CCBs), local education agencies, and other state and community agencies. First, a definition of transition services as provided in federal and state legislation is outlined. A rationale for early transition planning is followed by a discussion of eligibility for transition services under the Individuals with Disabilities Education Act and the Colorado Developmental Disabilities Act. Next, the roles and responsibilities of education, the CCB, and vocational rehabilitation are delineated. Suggestions for planning for transition urge inclusion of the CCB case manager in the students transition planning. Local school districts and CCBs are encouraged to identify the policies, procedures, and practices that can be coordinated for youth still in the public school system. A chart lists specific collaborative transition services and responsible agencies. Remaining sections discuss the referral process for a CCB and relevant policies and practices of the education system, the developmental disabilities system, and developmental disabilities services. The guide concludes with a summary of key points for transition planning at ages 14, 16, 18, and 21. Lists of Colorado CCBs and local vocational rehabilitation and special education offices are attached. (DB)