Which classification system is most commonly referenced in diagnosing psychological disorders?

The DSM, or Diagnostic and Statistical Manual of Mental Disorders, is the most commonly referenced classification system for diagnosing psychological disorders. It provides a comprehensive framework for mental health professionals that includes specific criteria for various psychological conditions, which facilitates standardized diagnosis and treatment across healthcare settings. The manual is widely used in clinical practice, education, and research, which contributes to its prominence in the field of psychology and psychiatry.

Unlike the other options, the DSM focuses explicitly on mental disorders and includes detailed descriptions of symptoms, prevalence, risk factors, and diagnostic features. This allows clinicians to make informed decisions when diagnosing patients. The ICD, while also important, is broader and includes all diseases and health conditions, not just mental health issues. The CIE, a classification of impairments, is less commonly utilized in diagnosis, and the RDoC is a research framework that emphasizes biological and behavioral measures but is not a diagnostic tool used in practice. Thus, the DSM's specific focus on mental disorders makes it the most referenced classification system in diagnosing psychological conditions.