anomaly

The preface of Thomas S. Kuhn's "The Structure of Scientific Revolutions" outlines the author's intellectual journey from physics to the history and philosophy of science, motivated by his exposure to outdated scientific theories that challenged his prior assumptions. Kuhn describes the development of his concept of scientific paradigms as a means to explain the differing levels of consensus and controversy in natural versus social sciences, and he acknowledges the essay's schematic nature, the need for further historical and sociological research, and the philosophical implications of his work.

This chapter explores how scientists respond to crises caused by anomalies in their paradigms, emphasizing that paradigms are not rejected solely due to anomalies but only when a viable alternative exists. It argues that anomalies alone do not falsify a paradigm; rather, paradigm shifts involve a complex judgment comparing the old and new frameworks. The chapter also discusses the nature of normal science, the persistence of anomalies, and the conditions under which anomalies escalate into crises prompting scientific revolutions.

This chapter explores the nature and necessity of scientific revolutions, defining them as non-cumulative episodes where an older paradigm is replaced by an incompatible new one. Kuhn draws a parallel between scientific and political revolutions, emphasizing that paradigm shifts involve community-wide persuasion rather than purely logical or empirical adjudication. He argues that cumulative scientific development is rare and that paradigm change is often necessitated by anomalies that existing paradigms cannot resolve.