2. Discuss validity and reliability of diagnosis





Diagnostic manuals



Reliability of diagnosis



 Study: Cooper et al. (1972) The US-UK Diagnostic Project



Validity of diagnosis



Study: Mitchel et al. (2009) Meta-analysis of validity of diagnosis of depression



Rosenhan (1973) On being sane in insane places



To test reliability and validity of diagnosis in a natural setting. Rosenhan wanted to see if psychiatrists could distinguish between “abnormal” and “normal” behavior.



This was a covert participant observation with eight participants consisting of five men and three women (including Rosenhan himself). Their task was to follow the same instructions and present themselves in 12 psychiatric hospitals in the USA.