This project has the long-term goal of designing and validating a psychometrically sound inventory of PTSD-related functional impairment for active duty service members and veterans. The inventory will include assessments of multiple dimensions of functional impairment and their impact on quality of life and explicitly show how PTSD symptoms are related to functional impairment. By creating and validating an inventory to assess PTSD-related functioning--as they are perceived and reported by active military personnel and veterans--we hope to offer a useful tool for clinicians, researchers and military leaders. A measure of PTSD-related functional impairment will have enormous value from a health care perspective in terms of identifying individuals with the disorder and for promoting more efficient allocation of resources and efforts towards those who are in most need. We anticipate that the end product of this study, an efficient, empirically-based measure of PTSD-related functional impairment will have an immediate impact on the assessment and treatment of military-related PTSD, in terms of promoting more efficient allocation of resources and efforts towards those who are in most need. Such a measure will also assist with PTSD-related compensation and pension procedures and decisions by providing a means to more accurately assess PTSD-related functional impairment.