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

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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.

When Attempting to Evaluate the Effectiveness of a Particular Form