Discuss the reliability and validity issues surrounding the classification and diagnosis of
schizophrenia ( 24 marks)

Schizophrenia is said to be a serious mental disorder characterised by a lack of contact with
reality and severe disruptions in psychological functioning. Researchers suggest that
schizophrenia isn't a single mental disorder and can…

vital in the diagnosis of schizophrenia therefore must have a test retest reliability to be
useful in this role. Wilks et al administered two alternate forms of the RBANS test to
schizophrenics over intervals varying from 1 ­ 134 days. The test retest reliability was fairly
high at 0.84. Prescott…