When diagnostic criteria define where normality ends and psychopathology begins, this is called what kind of a diagnostic system?

Categorical Diagnostic System

Explanation:

When diagnostic criteria define where normality ends and psychopathology begins, this is called a "Categorical Diagnostic System".

This type of diagnostic system tends to differentiate illnesses that are present or absent. In personality disorders, the diagnostic system places each disorder as separate and different. It is usually distinct from normal personalities"

So, "Categorical Diagnostic System" is the correct answer.

answer; /// i do believe the correct answer is ( a