What does the classical categorical approach to diagnosis assume about each person with a particular disorder?

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The classical categorical approach to diagnosis assumes that each person with a particular disorder will experience the same symptoms with little or no variation. This approach is based on the assumption that psychiatric disorders are discrete and qualitatively different from normal functioning. However, this approach has been criticized for its lack of flexibility and failure to account for individual differences in symptoms and responses to treatment.

What Does the Classical Categorical Approach to Diagnosis Assume About