Clinical psychology
Diagnostic impressions

After assessment, clinical psychologists may provide a diagnosis. Many countries use the International Statistical Classification of Diseases and Related Health Problems (ICD-10) while the US most often uses the Diagnostic and Statistical Manual of Mental Disorders. Both are nosological systems that largely assume categorical disorders diagnosed through the application of sets of criteria including symptoms and signs.

Several new models are being discussed, including a "dimensional model" based on empirically validated models of human differences (such as the five factor model of personality) and a "psychosocial model", which would take changing, intersubjective states into greater account. The proponents of these models claim that they would offer greater diagnostic flexibility and clinical utility without depending on the medical concept of illness. However, they also admit that these models are not yet robust enough to gain widespread use, and should continue to be developed.
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