Geoffrey M. Reed, PhD, is professor of medical psychology and director of the World Health Organization Collaborating Center for Research and Capacity Building for Global Mental Health, Department of Psychiatry, Columbia University Vagelos College of Physicians and Surgeons. He is also a consultant to the Department of Mental Health and Substance Use, World Health Organization (WHO) and works closely with the National Institute of Psychiatry Ram amp oacute n de la Fuente Mu amp ntilde iz, Mexico, where he was a founder of the Center for Global Mental Health Research. He is a Level III Member (highest level) of the National System of Researchers, National Council of Science and Technology, Mexico.

Dr. Reed was based at WHO in Geneva between 2 8 and 2 , where he was the senior project officer for the development of the classification of mental, behavioural, and neurodevelopmental disorders for the Eleventh Revision of WHO's International Classification of Diseases (ICD-11). His numerous awards include the Robert L. Spitzer, MD, Memorial Award for Outstanding Contributions to Nosology and Diagnosis, Department of Psychiatry, Columbia University Medical Center and the 2 2 American Psychological Association Award for Outstanding Lifetime Contributions to Psychology.

Pierre L.-J. Ritchie, PhD, is professor emeritus in the School of Psychology at the University of Ottawa. He was previously responsible for clinical training in the School's PhD program in clinical psychology and also served as director of the Center for Psychological Research and Services. He served as the main representative for psychology to the World Health Organization from 997 to 2 . In this role, he was closely involved in the inception and implementation of the plan for the revision of the classification of mental, behavioural, and neurodevelopmental disorders for the Eleventh Revision of WHO's International Classification of Diseases (ICD-11).

Dr. Ritchie has extensive leadership experience in the governance and management of national and international organizations as well as in health policy. He served as CEO of the Canadian Psychological Association and as executive director of the Canadian Register of Health Service Psychologists as well as a member of the Council of Representatives of the American Psychological Association. He was the longest serving secretary-general of the International Union of Psychological Science ( 99 -2 2).

Andreas Maercker, PhD MD, is professor of Psychopathology and Clinical Intervention at the University of Zurich, Switzerland, and codirector of the department amp rsquo s outpatient clinical services. Dr. Maercker was president of the German-speaking Society for Traumatic Stress Studies and subsequently held leading positions in the European and International Societies for Traumatic Stress Studies. He has chaired various committees and sections on research ethics and clinical psychology in the German and Swiss Psychological Associations and the European Association of Clinical Psychology and Psychological Treatment, which he co-founded in 2 7. His ongoing research interests include e-mental health interventions and cultural clinical psychology.

From 2 to 2 9, Dr. Maercker chaired the WHO Working Group responsible for developing proposals for the revision of trauma and stress-related disorders in the ICD-11. He has been awarded the Swiss Prize for Anthropological and Humanistic Psychology and the Wolter de Loos Award for Distinguished Contribution to Psychotraumatology in Europe from the European Society for Traumatic Stress Studies.

Tahilia J. Rebello, PhD, is assistant professor of Clinical Medical Psychology and research program manager of the WHO Collaborating Center for Research and Capacity Building for Global Mental Health, Department of Psychiatry, Columbia University Vagelos College of Physicians and Surgeons. She also served as consultant to WHO's Department of Mental Health and Substance Use from 2 3 to 2 8.

For over a decade, Dr. Rebello managed the implementation of the systematic program of more than 2 multilingual internet-based field studies that tested and strengthened the reliability, clinical utility, and global applicability of the ICD-11 classification of mental, behavioral, and neurodevelopmental disorders. Dr. Rebello also managed the expansion and engagement of WHO's Global Clinical Practice Network, now consisting of more than 8, mental health and primary care health professionals from 4 countries, which contributed to the ICD-11 directly by participating in these studies. She played a leadership role in the design and development of a comprehensive online training program for global clinicians aimed at facilitating the integration of ICD-11 into clinical practice across the world (gmhacademy.[...]

Foreword
Michael B. First
Chapter . A Psychological Approach to Diagnosis
Andreas Maercker, Tahilia J. Rebello, Pierre L.-J. Ritchie, and Geoffrey M. Reed
Chapter 2. A Global Approach to Diagnosis
Geoffrey M. Reed
I. Diagnosis of Mental and Behavioral Disorders
Chapter 3. Disorders of Intellectual Development and Developmental Learning Disorder
Ashok Roy and Cary S. Kogan
Chapter 4. Autism Spectrum Disorder
David Skuse, Kirsten Greaves-Lord, Graccielle Rodrigues da Cunha, and Gillian Baird
Chapter 5. Schizophrenia or Other Primary Psychotic Disorders
Tania Lincoln and Paul French
Chapter . Depressive Disorders
Rebeca Robles, Ana Fres amp aacute n, and Jos amp eacute Luis Ayuso-Mateos
Chapter 7. Bipolar and Related Disorders
Thomas D. Meyer, Tania Perich, Steven H. Jones, and Tatia M. C. Lee
Chapter 8. Anxiety and Fear-Related Disorders
Cary S. Kogan, Chee-Wing Wong, and Paul M. G. Emmelkamp
Chapter 9. Obsessive-Compulsive and Related Disorders
Christine Lochner, Paulomi M. Sudhir, and Dan J. Stein
Chapter . Disorders Specifically Associated With Stress
Chris R. Brewin, Maryl amp egrave ne Cloitre, Amy Y. M. Chow, and Andreas Maercker
Chapter . Dissociative Disorders
Andrew Moskowitz, Ellert Nijenhuis, Alexander Moreira-Almeida, and Roberto Lewis-Fernández
Chapter 2. Feeding and Eating Disorders
Kathleen M. Pike, Robyn Sysko, and Rachel Bryant-Waugh
Chapter 3. Bodily Distress Disorder
Oye Gureje and Akin Ojagbemi
Chapter 4. Disruptive Behavior and Dissocial Disorders and Attention Deficit Hyperactivity Disorder
Spencer C. Evans, Francisco R. de la Pe amp ntilde a, Walter Matthys, and John E. Lochman
Chapter 5. Disorders Due to Substance Use
Jason P. Connor and John B. Saunders
Chapter . Disorders Due to Addictive Behaviors and Impulse Control Disorders
Jo amp euml l Billieux, Naomi A. Fineberg, Daniel L. King, and Hans-J amp uuml rgen Rumpf
Chapter 7. Personality Disorder
Michaela A. Swales, Lee Anna Clark, and Alireza Farnam
Chapter 8. Neurocognitive Disorders
Antonio E. Puente, Theophilus Lazarus, Miguel P amp eacute rez-Garc amp iacute a, and Janna Glozman
II. Important Diagnoses Outside Mental and Behavioral Disorders
Chapter 9. Sexual Dysfunctions and Sexual Pain Disorders
Brigitte Khoury, Elham Atallah, Iv amp aacute n Arango-de Montis, and Sharon J. Parish
Chapter 2 . Sleep-Wake Disorders
Gualberto Buela-Casal, Almudena Carneiro-Barrera, and Katie Moraes de Almondes
Chapter 2 . Relationship Problems and Maltreatment
Richard E. Heyman, Amy M. Smith Slep, and Claudia Garc amp iacute a-Moreno