Published online by Cambridge University Press: 30 January 2026
Conceptual engineering is, prima facie, the engineering of concepts. But what are concepts? And in what sense, if any, can they be engineered? In this chapter I introduce conceptual engineering and then distinguish three different understandings of concepts. The first, prevalent in parts of cognitive science, is the psychological account, which sees concepts as psychologically real cognitive structures in individuals’ minds. The second, with historical connections to the pragmatism of Carnap, is the semantic account, which sees concepts as semantic meanings determined by conventional principles of use. The third, rooted in Frege’s rationalism and in anti-individualism, is the representationalist account, which sees concepts as publicly accessible components of thought, determined ultimately not by use but by direct relations between individuals and the world. Disagreements over the nature, target and possible implementation of conceptual engineering are, I will claim, ultimately grounded in the more fundamental disagreement over the nature of concepts.
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