Transition services for disabled students begin in high school and have been shown to impact their ability to matriculate to college or obtain employment. A review of the literature illustrates that there is a statistical gap between those postsecondary young adults with and without disabilities who enter college or the world of work. It is unclear how collaboration between Local Education Agencies (LEAs), community colleges, and the California Department of Rehabilitation impacts transitions for students with disabilities in moving forward to college or the world of work. Program Theory is used as a tool in this proposed study to understand how transition service programs are implemented in California Local Education Agencies (LEAs) for both disabled high school students and those that have graduated. In addition, the Logic Model Theory of Change provides an opportunity to examine why collaboration has been a difficult challenge between Local Education Agencies, community colleges, and state agencies in providing transition services for disabled young adults. This proposed study is intended to be a cross-sectional analysis of transition service collaboration for disabled high school students and postsecondary young adults. Survey data will be collected from Local Education Agency case managers, community college disabled services representatives, and Department of Rehabilitation representatives in Los Angeles County to identify the obstacles that inhibit collaboration between the transition service team members, the key ingredients that lead to successful transition services for students with disabilities, and how this postgraduate transition service team can better communicate with each other about services provided.