Krathwohl notes that internal validity is greater when the "effect" reinforces rather than reverses a prevailing tendency or condition.

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Krathwohl discusses that internal validity concerns how well an experiment is done, especially whether it avoids confounding (more than one possible independent variable acting at the same time). The statement about the "effect" reinforcing or reversing a prevailing tendency or condition is not directly related to internal validity but rather to the nature of the effect itself.

Krathwohl Notes That Internal Validity Is Greater When the "Effect