MENTAL DISORDERS are not static phenomena. At various times schizophrenia did not exist, bipolardisorder was manic depression and depressive disorder was melancholia treated by blood-letting (Benham, 1915). Homosexuality was a mental disorder subsequently re-classified as sexual orientation disturbance in 1974, before being removed from the DSM in 1987. Whilst major revisions in the classification of mental disorder occur infrequently, consideration of psychopathology –conceptualising, debating and clarifying diagnostic criteria and symptomology and investigating and evaluating effective treat-ments and interventions – is a continuous process. Whilst psychopathology can bedefined as ‘the study of abnormal states of mind’ (Gelder, Cowen & Harrison, 2006,p.2) classification of mental disorder does not fit neatly within tightly defined boundaries; there is no clear cut division between‘normality’ and ‘psychopathology’ (APA,2000; Maxmen, Ward & Kilgus, 2009).Over time, a wide range of factors have been used to define different disorders including dysfunction, distress, statistical deviation, disadvantage and aetiology.Current disorders included in the DSM are descriptively conceptualised as a ‘clinically
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