The author describes the support skills of Assertive Community Treatment（ACT）based on the activities of community mental health teams such as the Assertive Outreach Team（AOT）from Birmingham, Britain ; ACT/PACT teams from the states of Indiana and Washington in the U.S.; and three ACT（primarily ACT-K）teams from Japan. The author contrasts skills used in Britain and the United States with those used in Japan. Japanese ACT teams have demonstrated effectiveness using skills considered to be taboo in conventional psychiatric hospitals, and the author illustrates examples of such skills. Finally, the author qualitatively analyzes and explains the skills utilized by psychiatrists on ACT teams.