A technique has reliability to the extent that it yields consistent, repeatable results.

If its results depend on when, where, or how the technique was administered, its reliability might be questionable.

The technique improves delivery of services or client outcome

.

The extent to which the assessment technique...

has content appropriate for what is being measured.

The extent to which the assessment technique...

correlates with other techniques that measure the same thing.

Discriminant Validity

The extent to which the assessment technique...

does not correlate with techniques that measure somehting else.

The extent to which the assessment technique...

yields similar results across multiple administrations at different times.

A good test should be sensitive to change if there is change; after Tx scores should be expected to change.(i.e., developmental children each 6 months)

The extent to which the assessment technique...

yields similar results across different administrators.

Internal Reliability

(e.g., split-half reliability)

The extent to which the assessment technique...

consists of items that are consistent with one another.

286 out of 567; random sample.

The extent to which the assessment technique...

improves delivery of services or client outcome.

"I like electronics." (MMPI)

Should have face value but not be totally transparent to the client because we want to avoid client engaging in "fake good," or "social desirability."

Social Desirability Scale

..this controls for social desirability.