ABA foundationsThreats to Internal Validity in ABA: How to Spot Rival Explanations
Learn the main threats to internal validity in ABA, including history, maturation, testing, instrumentation, and treatment interaction.
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The full ABA Study Online article library is now organized by study path and learning intent. Start with RBT, BCaBA, BCBA, or ABA foundations, then narrow the topic without losing the wider study network.

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Track is the first decision. Topic is the second. The cards stay consistent so a learner can move between a definition, an exam question, and a practical guide without relearning the interface.
ABA foundationsLearn the main threats to internal validity in ABA, including history, maturation, testing, instrumentation, and treatment interaction.
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ABA foundationsLearn response maintenance in ABA, how it differs from generalization and fluency, and how maintenance is measured after intensive teaching changes.
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ABA foundationsLearn single-case design in ABA, including baseline logic, reversal, multiple baseline, multielement, changing criterion, and the limits of an AB sequence.
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RBT / BTLearn what an ABA competency assessment measures, how it differs from an exam, and how the current RBT process illustrates performance-based evaluation.
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ABA foundationsLearn what descriptive assessment means in ABA, how ABC observation records naturally occurring patterns, and why patterns are not the same as proof of function.
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ABA foundationsLearn parametric analysis in ABA, how it differs from comparative and component analysis, and how to read a simple parameter example.
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