If instruments such as the "big five" are used to describe personality, rather than relying on dsm-5, then diagnoses of psychological disorder would become:

The diagnoses of psychological disorders would be less categorical and more a matter of degree.

Explanation:

The "big five" model evaluates five personality dimensions, including responsibility, extraversion, kindness, emotional stability, and openness to experience, this model is considered a representative approach to what the person's personality is.

On the other hand, the DSM-V is a manual with the specifications of the different mental disorders. In it, you can find the descriptions of the symptoms and criteria to diagnose a mental illness.

In the case of using the big five model for the diagnosis of psychological disorders, this would be based on a category, which may limit the diagnosis. Contrary to what would happen if the DSM-V is used, which is based on the symptomatology of the person, this allows the diagnosis to be more precise.

I hope this information can help you.  

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