Mental disorders are common. A WHO study shows (Gore, Bloem, Ferguson, Coffey and Mathers, 2011) that during adolescence; most of the years lost because of illness are due to neuropsychiatric disorders such as depression, substance abuse and schizophrenia. Steinhausen, Metzke and Kannenberg (1998) found that 22% of the children and adolescents living in the canton of Zurich, suffer from mental disorders. The figures are comparable with Wittchen, Nelson and Lachner (1998) who fund 27% of the adolescents fitting the DSM IV (Diagnostic and Statistical Manual) criteria for mental disorders.