When attempting to evaluate the effectiveness of a particular form of therapy, the best way to measure improvement would be to

A) have the therapist rate the improvement.
B) have the clients rate their own improvement.
C) compare those who sought therapy to those who were not interested in receiving therapy.
D) have a "blind" observer evaluate each client without knowing who has received treatment.

Question

Nicholas Kieffer · Accepted Answer

Final Answer : D, Explanation :  Having a blind observer, who is unaware of which clients have received treatment, would provide the most objective and unbiased evaluation of therapy effectiveness. This reduces the potential for any biases, such as the placebo effect or the therapist's own biases, to influence the evaluation. Client self-reports and therapist ratings may be influenced by these biases and are therefore not as reliable. Comparing those who sought therapy versus those who did not also presents issues with confounding variables and may not provide an accurate evaluation of therapy effectiveness.

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