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In research, the ecological validity of a study means that the methods, materials and setting of the study must approximate the real-world that is being examined. Unlike internal and external validity, ecological validity is not necessary to the overall validity of a study.
Produced by Stephanie Tierney â Summer 2008 2. Internal and external validity. An experimental approach is said to be an effective means of strengthening: ï·Internal Validity â This relates to how far a study has established whether. a variable or condition under scrutiny has had an effect.