Following children with severe or profound intellectual and multiple disabilities and their mothers through a communication intervention: single-case mixed-methods findings.

Thirdly, it was not possible to know beforehand whether we had secured a stable baseline, and nor was it possible to control for the existence of a positive trend before moving on to the intervention—as generally required in single-subject experimental designs (Byiers et al. 2012 ).

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Visual inspection of Figure 10 may suggest a negative trend during baseline (as lower scores indicate lower interactive engagement), but according to standard levels for baseline-trend control (Tau- U > 0.4 at baseline as well as in phase comparison, and both trends in the same direction), baseline-trend control was not relevant in this case (Parker et al. 2011 ).

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