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The Calgary Depression Scale for Schizophrenia (CDSS)

The Calgary Depression Scale for Schizophrenia (CDSS) was developed to assess the level of depression in schizophrenia.  It is the only depression scale designed for the assessment of depression in schizophrenia and it differentiates between depression and the negative and positive symptoms of schizophrenia.  It has been extensively evaluated in both relapsed and remitted patients and is sensitive to change.  You can review the studies on the CDSS on PubMed (PubMed link here).  It has been cited in over 1,300 publications according to the Web of Science Citation Index.

The Scale is currently available in 44 language versions:

Arabic, Bulgarian, Chinese – Cantonese, Chinese - Mandarin (Simplified), Chinese - Mandarin (Traditional), Croatian, Czech, Danish, Dutch, English, Farsi, Finnish, French (Canadian), French (France), German, Greek, Hebrew, Hindi, Hungarian, Icelandic, Indonesian, Italian, Japanese, Korean, Latvian, Malay, Norwegian, Polish, Portuguese (Brazil), Portuguese (Portugal), Romanian, Russian, Serbian, Slovak, Spanish (Argentina), Spanish (Mexico), Spanish (Spain), Swedish, Tagalog (Filipino), Thai, Turkish, Ukrainian, Urdu, Yoruba.

The scale is designed for use by an experienced rater.  It is not intended for self assessment, and any person concerned about schizophrenia should see a medical professional.  The University of Calgary, Alberta Health Services and Dr. D. Addington accept no responsibility for the Scale if it is not administered under appropriate conditions by a trained professional.

Copyright: Dr. Donald Addington holds the copyrights for English version and the translations.

Dr. Donald Addington
Dept of Psychiatry
Foothills Hospital
1403 - 29th Street NW
Calgary, Alberta Canada T2N 2T9

Phone: (403) 944-2637
Fax: (403) 270-3451

Conditions for Use:

The scale may be used with permission at no cost by students or clinicians using it in routine clinical practice.  The CDSS is now distributed by Mapi Research Trust a not for profit organization.  All requests for its use have to be submitted through the Mapi Research Trust’s ePROVIDETM platform.  Submitting a request is completely free of charge and will ensure an optimized service.

Translation of CDSS:

Is there a version of the CDSS in your language or a language that you need to use? Are you interested in translating the CDSS into the language that you need?

If you wish to translate the scale into another language professional translation services are available through  Mapi Research Trust a not for profit organization. 

1. Go to submit a request.

2. If you haven't registered yet, you'll be asked to sign up for free.

3. Complete the request form. You may attach documents if need be.

This tutorial may guide you through the process.
For any further help, please consult the FAQ, or contact Mapi at


For any questions about the content currently on this web site contact :
Nancy Colp at