The Scientific Method
The iterative process of observation, hypothesis, prediction, experiment, and revision that underlies empirical science.
The scientific method is the cycle of procedures by which empirical science generates and tests explanations of the natural world. In its textbook form it runs: observe a phenomenon, form a hypothesis that explains it, derive testable predictions from the hypothesis, test the predictions by experiment or systematic observation, and revise or reject the hypothesis according to the results. The cycle then repeats with improved hypotheses. This idealized description is a rational reconstruction — real research is messier, with luck, error, and competition — but it captures the norms that make scientific claims trustworthy.
Two logical points structure the method. First, hypotheses must be falsifiable, as Karl Popper emphasized: a claim that no observation could possibly contradict (for example, an unfalsifiable conspiracy theory) is not scientific, no matter how plausible it sounds. Second, a hypothesis can never be finally proven by confirming instances — the next observation may refute it — but a single well-established counterexample can refute it. Science therefore progresses by conjectures and refutations, and the problem of induction describes exactly why generalization from observations cannot be deductively justified.
Prediction and control are what separate testing from storytelling. A good hypothesis makes precise predictions that distinguish it from rivals, ideally including novel predictions the hypothesis was not designed to fit. Experiments manipulate variables while controlling confounds, and the results are quantified with statistical methods: hypothesis testing decides whether an observed effect could plausibly be chance, and Bayes' theorem provides the normative framework for updating belief in a hypothesis as evidence accumulates. Replication by independent groups is the community-level check that individual findings are real.
The scientific method is not a single fixed recipe, and different fields adapt it: astronomy and geology rely on observation rather than experiment, medicine on randomized controlled trials, and mathematics on proof. But the core norms — public evidence, testable claims, correction in the face of disconfirmation, and provisional acceptance — are shared across the sciences, and they are what distinguish science from dogma, pseudoscience, and mere opinion.
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epistemology falsification science scientific method