PTSD: National Center for PTSD

International Trauma Interview (ITI)

Roberts et al., 2025

Description

The ITI is a free (public-domain) semi-structured clinician interview measure to assess for International Classification of Diseases (11th Edition; ICD-11) PTSD and complex PTSD (CPTSD). It is designed to be administered following the International Trauma Exposure Measure or another structured trauma event assessment. The ITI includes items assessing the traumatic event, the 3 core PTSD symptoms of the ICD-11, the 3 core ICD-11 disturbances of self-organization (DSO), functional impairment related to both PTSD and DSO, duration, and global validity. For each symptom, standardized questions and probes are provided.

Administration and Scoring

The ITI was designed to be administered by clinicians or researchers with a bachelor’s degree or higher in a mental-health-related field who have knowledge of ICD-11 PTSD and CPTSD and have attended an approved ITI training workshop.

Scoring criteria are outlined in the interview itself.

Sample Item

When you are upset how easy is it for you to calm down?

Can you give me some examples of what makes you upset and how you react? (Any other examples? Do other people notice when you are upset? What do they see?)

[If not clear:] How do you react when you have a minor argument or if you feel that you have made a mistake, are being misunderstood or criticized?

Versions

The ITI has been translated into multiple languages. Not all translations have been validated to date.

References

Roberts, N. P., Hyland, P., Fox, R., Roberts, A., Lewis, C., Cloitre, M., Brewin, C. R., Karatzias, T., Shevlin, M., Gelezelyte, O., Bondjers, K., Fresno, A., Souch, A., & Bisson, J. I. (2025). The International Trauma Interview (ITI): Development of a semi-structured diagnostic interview and evaluation in a UK sample. European Journal of Psychotraumatology, 16(1), 2494361. https://doi.org/10.1080/200008066.2025.2494361

To Obtain Scale

Interviewers who have been trained in the administration of the ITI can request the measure using a request form.

Measure availability: We provide information on a variety of measures assessing trauma and PTSD. These measures are intended for use by qualified mental health professionals and researchers. Measures authored by National Center staff are available as direct downloads or by request. Measures developed outside of the National Center can be requested via contact information available on the information page for the specific measure.

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