How does instrumentalism interpret scientific theories?

In the philosophy of science, instrumentalism interprets scientific theories not as literal descriptions of reality, but as functional tools or devices for solving practical problems and generating accurate empirical predictions.12

Key aspects of this interpretation include:

• Utility over Truth: Instrumentalists argue that the value of a theory is determined by its usefulness—such as its ability to "save the phenomena"—rather than its truth or falsehood. They often question whether it is meaningful to label theoretical terms as "true" or "false" at all.12
• Inference Rules: Theories are viewed as sets of inference rules or formal calculi. In this framework, theoretical vocabulary serves a functional role in connecting observable evidence to observable predictions, even if the theoretical terms themselves remain uninterpreted or lack direct correspondence to external reality.23
• Opposition to Realism: This view stands in direct contrast to scientific realism, which asserts that the goal of science is to provide a literally true account of the world, including its unobservable aspects.12

Instrumentalism is often motivated by the idea that theories are underdetermined by data and that historical shifts in science demonstrate that even highly successful theories can eventually be discarded, suggesting they do not necessarily approximate an objective truth.1