As single subject research designs become more complicated moving from A-B to A-B-A to A-B-A-B designs, they:

Question

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The progression from simpler to more complex single subject research designs (A-B to A-B-A to A-B-A-B) allows for repeated measures and the reintroduction of conditions, which helps in establishing the reliability of the intervention's effects on behavior. This repeated testing under controlled conditions makes it more likely that observed changes in behavior can be confidently attributed to the intervention, rather than to external variables.

As Single Subject Research Designs Become More Complicated Moving from A-B