When determining the causes of behavior, nothing other than a causal variable could be responsible for the observed effect. According to Cook and Campbell (1979), this type of evidence is called elimination of

elimination of alternative explanations

Explanation:

Cook and Campbell described three kinds of evidence that can be used to recognize the cause of a behavior maximizing internal validity: temporal precedence, covariation of cause and effect, and alternative explanations.

The elimination of alternative explanations refers to making sure that only one causal variable can be accountable for a specific observed effect.

Rushed conclusions may lead to leaving aside other possible causes.

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