Scientific progress

Scientific progress is the cumulative, directional change in humanity's capacity to predict and intervene in the natural world. The dominant philosophical account, associated with Thomas Kuhn, holds that progress is not linear but punctuated: long periods of "normal science" are interrupted by scientific revolutions in which the foundational assumptions of a field are replaced.

Kuhn's framework correctly identifies that scientific change is not merely the accumulation of facts but the reorganization of conceptual frameworks — what he called paradigm shifts. But the framework understates the continuity across revolutions. The equations of Newtonian mechanics were not discarded by relativity; they were demarcated to a domain of applicability. The germ theory of disease did not erase prior clinical knowledge; it recontextualized it. Scientific progress is better understood as a nested hierarchy of theories, each valid within its scale of application, with deeper revolutions producing new levels of the hierarchy rather than replacing old ones. This is the same pattern that appears in Scale separation across physics: new theories do not falsify old ones but enclose them as limiting cases.