Abstract
Psychotic disorders such as schizophrenia have a lifetime prevalence of over 1% and are among the world's leading causes of disability. They have potentially high personal, social, and economic impact. Their onset is usually in adolescence and young adulthood, meaning that the most productive years of a person's life are affected and could lead to live many years with the illness. Given this background, there has been an increasing emphasis on early intervention to detect illness early and minimize disability. In the 1990s criteria were developed that aimed to detect individuals in the prodromal phase of disorder. This chapter outlines the development of this strategy.
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