Why philosophers have spent two millennia failing to define what counts as science
In short: The demarcation problem asks how we distinguish science from pseudoscience, art, or myth. Despite centuries of debate, no single, universally accepted criterion exists. From Aristotle to modern scholars, thinkers have struggled to draw a bright line, leading some to argue the entire pursuit is a futile, rhetorical exercise.
The quest to define science began with Greek natural philosophers seeking to separate their methods from mythology. Aristotle proposed that scientific knowledge required logical demonstration and apodictic certainty. Centuries later, the Vienna Circle’s logical positivists introduced the verifiability criterion in the 1920s, arguing that only empirically verifiable statements were meaningful. They dismissed other claims as metaphysics, a stance that Karl Popper famously rejected. Popper argued that verificationism was flawed because empirical observations cannot support universal statements; instead, he proposed falsifiability—the idea that a theory is only scientific if it can be tested and potentially refuted.
Popper’s criterion faced significant criticism. Critics like Larry Laudan argued that the demarcation problem is a pseudo-problem, noting that many well-founded beliefs are not scientific, while some scientific conjectures lack strong foundations. Laudan suggested that philosophers should focus on distinguishing reliable from unreliable knowledge rather than policing the boundaries of science. Meanwhile, Thomas Kuhn argued that science is defined by puzzle-solving activity, contrasting the progress of astronomy with the stagnation of astrology. Paul Feyerabend went further, suggesting that the search for a demarcation criterion is an insidious attempt to grant science an unjustified, authoritative status in public discourse.
Despite these philosophical disagreements, the practical need for demarcation remains high. Michael D. Gordin notes that the myth of a clear demarcation is essential for science education and public literacy. In the political arena, the distinction is vital for addressing issues like climate-change denial and anti-regulatory doctrines. By maintaining a boundary, society can refuse to let political or religious authorities pass binding judgments on factual claims. Whether through Paul R. Thagard’s focus on progressiveness or recent multi-criterial meta-analyses like those published by Damian Fernandez-Beanato in 2025, the debate continues because the stakes—ranging from informed nutrition to democratic integrity—remain profoundly significant.
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