In single case designs, another name for a pretest-postest methodology is an)___________ design.

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A pretest-posttest methodology is commonly referred to as an AB design in single case designs. The AB design involves measuring behavior (the dependent variable) before and after a treatment (the independent variable) is introduced. The lack of a control group or multiple measurement phases makes this design weaker compared to other single case design options. The other options listed (ABA, ABAB, and Multiple Baseline) are all different types of single case design variations.

In Single Case Designs, Another Name for a Pretest-Postest Methodology