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Philosophy of science

The philosophical study of what science is, how it works, and what it can know. The field moved from logical positivism’s confidence in a single scientific method through Popper’s falsificationism, Kuhn’s paradigm shifts, and Feyerabend’s methodological pluralism — a trajectory from unity toward diversity, from certainty toward fallibilism.

The core questions

What distinguishes science from non-science? How does scientific knowledge grow? Is there a single scientific method? Do scientific theories describe reality or merely predict observations? Is scientific progress convergent (toward one truth) or divergent (producing multiple incommensurable frameworks)?

Key developments

Logical positivism (Vienna Circle, 1920s–30s) set the starting point: meaningful statements are either logically true or empirically verifiable. Science is the paradigm of knowledge; metaphysics is meaningless. The unity of science was the programme — one language, one method, one world.

Popper broke with verification. A theory is scientific if it is falsifiable — if it risks being wrong. Science advances through bold conjectures and severe tests. What survives is not confirmed but not yet refuted. Fallibilism replaces certainty; error-elimination replaces proof.

Kuhn broke with continuity. Science does not accumulate smoothly — it alternates between normal science (puzzle-solving within a paradigm) and revolutions (paradigm replacement). Across revolutions, key terms change meaning — incommensurability. Whether science progresses toward truth is a question Kuhn deliberately left open.

Lakatos tried to save rationalism while accommodating history. His research programmes replace Popper’s single conjectures with evolving sequences of theories sharing a hard core of commitments. A programme is progressive if it keeps predicting new facts; degenerating if it only accommodates what’s already known. The criterion is rational but the timescale is historical — you can’t tell in advance.

Feyerabend broke with method. Every methodological rule has been productively violated in the history of science. “Anything goes” — not as chaos but as the only principle that does not block discovery. Science is one tradition among many, with no inherent authority over others.

The trajectory

From a single method to no fixed method. From verification to falsification to paradigm shifts to epistemological anarchism. From unity to plurality. The field’s own history traces the trajectory it studies.

Persons

Popper · Kuhn · Feyerabend