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Following the establishment of a baseline in a single-subject design, the treatment phase (Phase B) is initiated by introducing the experimental intervention. The dependent variable may fluctuate initially as the participant adjusts, so the researcher waits until responding reaches a new steady state to accurately assess the treatment's impact.

Treatment Phase

In a single-subject design, researchers typically evaluate the final impact of an experimental intervention immediately upon entering the treatment phase, regardless of initial fluctuations in the dependent variable.

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