An ABAB design is preferred to a multiple-baseline design if the treatment is expected to have a permanent or long lasting effect.

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A multiple-baseline design is preferred in situations where it is not ethical or feasible to withdraw treatment once it has been effective. It allows for a comparison of baseline and treatment phases across different settings or behaviors. In contrast, an ABAB design involves withdrawing treatment to see if behavior returns to baseline levels, which may not be ethical or practical in some cases.

An ABAB Design Is Preferred to a Multiple-Baseline Design If