Rethinking Scientific Progress
Thomas Kuhn was a highly influential American philosopher of science whose work completely transformed how we understand scientific progress.
Before Kuhn, the dominant view held that science was a purely linear and cumulative process, where researchers steadily added new, objective facts to an ever-growing pile of knowledge. Kuhn shattered this view with his landmark 1962 book, The Structure of Scientific Revolutions.
Paradigms and Revolutions
Kuhn argued that the history of science is not a smooth, continuous climb toward absolute truth, but rather a series of periodic, radical upheavals.
He introduced a cycle of scientific development:
- Normal Science: During this phase, the scientific community operates under a shared paradigm—a dominant framework of theories, assumptions, and methods. Scientists engage in routine “puzzle-solving” within this established framework, rather than attempting to discover entirely new phenomena.
- Crisis: Inevitably, anomalies arise that the current paradigm cannot explain. When these anomalies accumulate and become too glaring to ignore, the field enters a state of crisis.
- Revolutionary Science and Paradigm Shift: To resolve the crisis, a new paradigm is proposed. If successful, the community abandons the old framework and adopts the new one. Kuhn famously called this a “paradigm shift.”
Kuhn controversially suggested that competing paradigms are often “incommensurable”—meaning they use different languages and standards of evidence, making it impossible to evaluate them objectively against a single, neutral standard of truth. This idea forced philosophers to acknowledge the profound social and historical dimensions of scientific inquiry.
Consider an example situation in this practice exercise:
According to Thomas Kuhn, what characterizes the period of 'Normal Science'?
Analytical Worked Example
A strong philosophical analysis does not merely name a doctrine; it tests what the doctrine can explain, what it must assume, and where it becomes costly. Consider a student evaluating Thomas Kuhn and Paradigm Shifts through an ordinary disagreement. One person claims the position is attractive because it gives a clear standard for judgment. Another objects that the same standard may oversimplify human experience. The useful response is not to choose a side immediately, but to reconstruct the argument in stages: define the central claim, identify the reasons offered for it, state the strongest objection, and then decide whether the theory can answer that objection without changing into a different theory.
For this topic, that means asking three questions. First, what is the theory treating as basic: reality, knowledge, duty, happiness, virtue, language, power, experience, or social order? Second, what does it count as evidence: logical consistency, perception, historical explanation, practical success, reflective equilibrium, or lived experience? Third, what would falsify or seriously weaken the view? A doctrine that cannot name its own pressure points is not yet a philosophical position; it is only a slogan.
A good revision also distinguishes exposition from evaluation. Exposition asks what the view says and why its defenders found it compelling. Evaluation asks whether the view survives comparison with rival accounts. Keeping those tasks separate prevents two common errors: rejecting a theory before understanding its internal logic, and summarizing a theory so sympathetically that no critical judgment remains.
Example
Suppose an essay argues that Thomas Kuhn and Paradigm Shifts is persuasive because it gives a disciplined answer to the lesson’s central problem. The essay should give a concrete case, not just a definition. It might compare two decisions, two interpretations of an artwork, two accounts of personal identity, or two political institutions. The example should show how the view changes the conclusion. If the same conclusion would follow without the theory, the example has not done enough philosophical work.
Exercise
Write a short argument map for this lesson’s main view. Use four labeled lines: claim, reason, objection, and reply. The claim should be one sentence. The reason should explain why an intelligent defender would accept it. The objection should be charitable rather than dismissive. The reply should either answer the objection or concede a limit. After writing the map, revise the claim so it becomes more precise and less rhetorical.