The Structure of Scientific Revolutions: 8 key ideas
The core ideas of The Structure of Scientific Revolutions, each in under a minute, written in our own words. Want the full depth? Get the book.
- IDEA 1 OF 8
Science does not grow smoothly
Kuhn argues that science does not simply build up knowledge step by step.
Instead, long periods of steady work are broken by sudden revolutions that change how scientists see the world.
- IDEA 2 OF 8
Paradigms frame scientific work
Kuhn introduces the idea of a paradigm, a shared set of theories, methods and examples that guides a scientific community.
It tells scientists what questions to ask and how to answer them.
- IDEA 3 OF 8
Normal science solves puzzles
Kuhn describes normal science as work done within a paradigm, solving puzzles it defines.
Scientists in this phase rarely question the paradigm itself. Most daily scientific work, Kuhn says, looks like this, filling in details of a picture already accepted.
- IDEA 4 OF 8
Anomalies challenge the paradigm
Kuhn explains that sometimes results appear that the paradigm cannot explain.
At first these anomalies are ignored or explained away, but they can build up over time. A single odd result is easy to dismiss, but many are harder to ignore.
- IDEA 5 OF 8
Crisis opens the door to change
Kuhn argues that when anomalies pile up, a field enters a crisis.
Scientists begin to question basic assumptions and consider new approaches. Old rules stop working well, and people become willing to try ideas that once seemed unthinkable.
- IDEA 6 OF 8
Revolutions replace old views
Kuhn describes scientific revolutions, such as the shift from an Earth-centred to a Sun-centred universe.
A new paradigm replaces the old one, changing the whole field. Kuhn sees these as sudden jumps, not slow and steady progress.
- IDEA 7 OF 8
Paradigm shifts change perception
Kuhn argues that after a paradigm shift, scientists see the world differently, as if wearing new glasses.
The same data can look entirely different. A scientist trained in a new paradigm notices things the old view never made visible.
- IDEA 8 OF 8
Rival paradigms are hard to compare
Kuhn argues that rival paradigms can be incommensurable, meaning they lack a common measure.
Scientists on each side may talk past each other, using the same words differently. This is one reason why such changes of view are often slow and tense.
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