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| relation between a model, a system and an experimental_frame. Answers the question of whether it is impossible to distinguish the model and system in the experimental_frame. | |||||||||||||||||||
| In the most basic concept replicative_validity, validity is affirmed if, as far as the experiments possible within the experimental_frame, the behavior of the model and system agree within acceptable tolerance. Stronger forms of validity are predictive_validity and structural_validity. | |||||||||||||||||||