Governments around the world have given priority to "early intervention", i.e. the early diagnosis and treatment of young adults with psychotic symptoms. One of the main problems with this approach, is that only a small proportion of these young adults can be expected to go on to develop schizophrenia, yet all the treatment regimes are derived from work with adults who have had full psychotic episodes. Why Does Schizophrenia Develop at Late Adolescence? proposes a controversial new model of ho