A typical withdrawal design is usually designated by the letters (where A represents baseline and B represents intervention):

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The A-B-A-B design is considered the most robust withdrawal design as it includes a return to baseline after the intervention is withdrawn, followed by reintroduction of the intervention, and a return to baseline once again. This design allows for replication of results and strengthens the evidence for the effectiveness of the intervention.

A Typical Withdrawal Design Is Usually Designated by the Letters