BCBA Task List Domain D. Experimental Design Study Guide: Definitions, Examples, Comparison Tables, Visual Graphics, Quizzes, and Matching Activity D.1. Distinguish between dependent and independent variables. D.2. Distinguish between internal and external validity. D.3. Identify threats to internal validity (e.g., history, maturation). D.4. Identify the defining features of single-case experimental designs (e.g., individuals serve as their own controls, repeated measures, prediction, verificati