If a researcher is planning an ABAB design but the participant does not respond to the treatment, the researcher can simply switch to a new treatment and begin a more complex phase-change design.

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In an ABAB design, if the initial treatment is ineffective, the researcher can adapt the study by introducing a new treatment, transitioning to a more complex phase-change design to assess the effectiveness of the alternative intervention. This flexibility allows for the exploration of more suitable interventions within the same experimental framework.

If a Researcher Is Planning an ABAB Design but the Participant