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Recently studies have shown how the availability of state programs and services are associated with outcomes from TBI. This study will extend those investigations to develop a reliable method to elicit participant use of state programs and services. Accounting for other sources of social support, the study will also examine the relationship between use of state programs and services on outcomes following moderate/severe traumatic brain injury. First, an interview instrument will be developed and tested for reliability and predictive validity. Then, 200 TBI Model Systems participants at 2-30 years post-injury will complete follow-up interviews at participating centers. From this data we will develop a method for identifying the use of state programs and services and provide an initial test of their effect on outcomes.