 Objectives: To meet a VA-wide need for early diagnosis of mild traumatic brain injuries TBI in returning soldiers, in April 2007 VA established policy and procedures for screening and evaluation of possible TBI in OEF and OIF veterans. Although the screening process has been in effect for over a year, the validity, reliability, false positive rates, and false negative rates of the TBI Clinical Reminder are unknown. The purpose of this research is to develop a gold standard and then assess the validityreliability of the TBI Clinical Reminder screen. Specific short-term objectives for this study include: 