The presentation will summarize the evidence to date regarding the construct validity for ICD-11 Complex PTSD, it’s factor structure and sample characteristics that distinguish it from PTSD including trauma history, comorbidity and functional impairment. Data from four different countries will be presented evaluating similarities and differences in the proposed Complex PTSD symptom profile. The development of self-report and clinical interview measures for Complex PTSD will be discussed particularly in terms of the ICD mission of enhancing the clinical utility of trauma and stress related disorders world-wide.