- Two major diagnostic criteria systems - ICD and DSM
- MAIN difference between the two is that DSM states that the symptoms must be present for at least 6 months whildst ICD only requires one month.
- Crow (1980) found it useful to distinquish between 'positive symptoms' (addition to normal behaviour) and 'negative symptoms' (disruption of normal behaviour)
Course of the disorder
- Generally develops in early adult life (late teens early twenties)
- Although men and women are usually equally affected, the average age of development can be 5-10…