However, for most mental disorders, exclusive reliance on the medical model leads to an incomplete understanding, and, frequently, to incomplete or ineffective treatment interventions. The current Diagnostic and Statistical Manual of Mental Disorders (DSM-5), addresses this point in part, stating, "However, in the absence of clear biological markers or clinically useful measurements of severity for many mental disorders, it has not been possible to completely separate normal and pathological symptom expressions contained in diagnostic criteria. This gap in information is particularly problematic in clinical situations in which the patient's symptom presentation by itself (particularly in mild forms) is not inherently pathological and may be encountered in individuals for whom a diagnosis of 'mental disorder' would be inappropriate." [3]