The primary aims of this study are to: 1) Establish the concurrent criterion-related validity of four traumatic brain injury (TBI) screening questions (TBI-4) using the Ohio State University TBI Identification Method (OSU TBI-ID) and 2) Establish the concurrent criterion-related validity of the TBI-4 with the addition of detailed information elicited by the four questions. Secondary aims include: 1) Determining if the addition of detailed information elicited by the TBI-4 results in increased specificity; 2) Determining whether the prevalence of traumatic brain injury (TBI) in this sample is concordant with previous research; and 3) Determining whether psychiatric outcomes are worse for veterans with traumatic brain injury (TBI) than those with no traumatic brain injury(TBI).