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Why do instrumentalists focus on a theory's ability to make accurate predictions?
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Philosophy of science
Aristotle, marble portrait bust, Roman copy (2nd century bce) of a Greek original (c. 325 bce); in the Museo Nazionale Romano, Rome.
Instrumentalists focus on a theory's ability to make accurate predictions because they view scientific theories primarily as tools for solving practical problems rather than as literal descriptions of reality. This perspective is rooted in several key philosophical arguments:1
- Underdetermination: Instrumentalists argue that scientific theories are necessarily underdetermined by available data. Since no finite amount of empirical evidence can conclusively prove a theory is true or rule out all alternative explanations, they contend that evaluating a theory based on its "truth" is not meaningful.1
- Historical Precedent: The history of science shows that many theories once considered true—such as the existence of the ether—have been discarded. Instrumentalists argue this suggests that current theories may also be replaced, making their predictive utility a more reliable metric than their purported truth.1
- Pragmatic Utility: Influenced by pragmatism, instrumentalists believe the value of an idea lies in its usefulness. They treat theories as sets of inference rules designed to "save the phenomena," focusing on empirical adequacy rather than ontological claims about unobservable entities.12