Why scientific progress is a series of revolutions, not a steady climb
We often imagine science as a linear accumulation of facts, a steady ladder toward truth. But according to Thomas Kuhn, the history of science is actually defined by sudden, disruptive breaks that fundamentally rewrite the rules of reality.
In his 1962 landmark work, *The Structure of Scientific Revolutions*, American philosopher Thomas Kuhn challenged the idea of science as a continuous, linear progression. Instead, he proposed that scientific fields undergo periodic "paradigm shifts." During periods of "normal science," researchers engage in routine "puzzle-solving" within an established framework. However, when enough anomalous results accumulate that the existing framework can no longer account for them, the field enters a crisis, eventually leading to a revolutionary transition to a new paradigm.
Kuhn’s theory introduced the provocative concept of incommensurability: the idea that competing paradigms are so fundamentally different in their assumptions and terminology that they cannot be directly compared using a single objective standard. This suggests that scientific truth is not merely an objective discovery but is shaped by the consensus of the scientific community. Critics, such as David Stove, argued this could lead to scientific relativism—the idea that theory choice becomes irrational. Kuhn countered this by suggesting that while scientists use criteria like accuracy, consistency, and simplicity to choose between theories, these function more as values than rigid rules.
Later in his career, Kuhn’s focus shifted from the concept of the "paradigm" to the linguistic and taxonomic structures of science. He began to view scientific revolutions as changes in the underlying classification of scientific terms. Despite these shifts in emphasis, his work remains the most widely cited in the social sciences, fundamentally altering our understanding of how human knowledge evolves through structural transformation rather than simple accumulation.
Source: Thomas Kuhn
