Kuhn originally argued that scientific paradigms are incommensurable, in that they could not be evaluated against one another in terms of their validity.

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Kuhn's concept of incommensurability refers to the idea that scientific paradigms are based on different conceptual frameworks and therefore cannot be directly compared or evaluated against one another in terms of their validity. This led to his famously controversial claim that scientific progress is not a linear accumulation of knowledge but rather a series of shifts in paradigms.

Kuhn Originally Argued That Scientific Paradigms Are Incommensurable, in That