Lesson · 4 min Stretch
Paradigm Shifts
In one line Fields work inside a shared frame until too many anomalies build up and the frame itself changes.
Thomas Kuhn argued that science does not simply pile up facts. Most of the time, scientists work inside a paradigm, a shared frame of methods and assumptions that tells them which questions matter and how to answer them. He called this normal science.
Along the way, results appear that the frame cannot explain. Most are set aside as noise or mistakes. When anomalies mount, some people start to propose a different frame, and a crisis follows. If the new frame does better, the field shifts, as when astronomers moved from Earth-centered to Sun-centered models.
The lesson reaches beyond science. Any group can work inside a frame. It is worth asking which results you explain away, and whether they are piling up.
Go deeper
Kuhn’s book, The Structure of Scientific Revolutions, drew complaints that he made science irrational. He replied that a new paradigm wins on grounds such as accuracy, scope and simplicity, but that these values can be weighed differently, so the choice is not a simple calculation. A new paradigm can also lose some things the old one did well, which philosophers call Kuhn-loss.
He also noted that paradigms are not always replaced by argument alone; often a new generation grows up with the new frame and the old one fades.
The old map
A delivery firm has used the same route plan for ten years. Drivers report that one road is always slow, but dispatchers treat each case as bad luck.
Eve collects the reports and finds that sixty percent of late trips use that road. The plan assumed it was fast. The firm redraws the routes from scratch instead of adjusting the old ones, and deliveries improve.
Try this today Name one rule of thumb in your work that you have not questioned, and one fact that does not fit it.
Cite or share this lesson
A plain reference you can paste into notes or an essay:
Quest2Reason. “Paradigm Shifts.” https://quest2reason.com/learn/lesson/paradigm-shifts. Accessed 13 November 2026.
Sources
- Stanford Encyclopedia of Philosophy, “Thomas Kuhn” — Covers normal science, anomalies and paradigm change.
- Thomas Kuhn, The Structure of Scientific Revolutions (1962) — The book itself, including the remark that a new generation often carries the new frame.