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Why did John Dewey believe ideas must be tested through experience?

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John Dewey, an older man with glasses and a mustache, sits and reads a document, wearing a suit and tie. — John Dewey John Dewey.

John Dewey, a central figure in American pragmatism, viewed ideas as "instruments" or tools designed to help humans navigate and make sense of the world. Under his theory of instrumentalism, he argued that ideas function as plans of action and predictors of future events.1

Because ideas are essentially hypotheses about how specific actions will produce determinate results, they must be tested through experience to determine if those predictions are accurate. Dewey believed that inquiry is an active, self-corrective process; by introducing variations into a situation and measuring the outcomes, individuals can refine their understanding and mitigate the risk of error.12

Ultimately, Dewey maintained that ideas are not infallible reflections of reality but are instead means to direct natural and social processes toward human benefit. This experimental approach—which he applied to science, ethics, and education—serves as a method for solving problematic conditions and fostering continuous growth, which he considered the only true moral "end".12