Not all evaluative researchers have the luxury of measuring the client on the target behavior or problem before treatment begins. This weakness can be dealt with by measuring the client several times during the first treatment period, followed by a change in the treatment while continuing to measure the client's target behavior or problem repeatedly during the second treatment period.

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This approach is known as a multiple baseline design and is commonly used when pre-treatment measurements are not possible or feasible. By measuring the client's target behavior or problem repeatedly during both treatment periods, evaluative researchers can determine whether the change in treatment resulted in any significant improvements.

Not All Evaluative Researchers Have the Luxury of Measuring the Client