The most appropriate test of the validity of a diagnostic system is its correspondence with behavioural observations.

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The most appropriate test for the validity of a diagnostic system is to compare its results with observations of the person's actual behavior or symptoms. This is because a valid diagnostic system should accurately reflect the person's true condition. Other measures of validity can also be important, such as reliability, sensitivity, and specificity, but behavioral observations are a key factor in evaluating a diagnostic system's validity.

The Most Appropriate Test of the Validity of a Diagnostic