[The development of the ICD-11].

The ICD-10 will have been used for approximately twenty years by the time the new revision of the ICD (ICD-11) is completed, and the revision process is being implemented. Accordingly, the WHO has organized groups of experts designated to deal with issues in each field, and the International Advisory Group for the Revision of ICD-10 Mental and Behavioral Disorders has been launched for the field of psychiatry. Regarding the revision, this group is responsible for ultimate decision-making in establishing a framework for the new version. We reported processes of the ICD-11 by the above mentioned group and its coordinating groups and working groups. In addition, we reported the WHO-WPA Survey which was distributed to 500 members of the Japanese Society for Psychiatry and Neurology.