Questions: The Demarcation Problem

Question 1

Popper's falsifiability criterion faces the Duhem-Quine objection. What is the core of that objection?

• A. Some perfectly good scientific theories have never actually been tested empirically
• B. When an experiment fails, it could falsify any of the auxiliary assumptions bundled with the theory, not necessarily the core hypothesis — so no individual claim is ever straightforwardly falsified
• C. Falsifiable claims can never be positively confirmed, only tentatively accepted, which is too weak a basis for scientific knowledge
• D. Falsifiability cannot explain why astrology and astronomy are different in practice

Answer: (B)

The Duhem-Quine thesis points out that scientific theories are never tested in isolation — a prediction requires the core theory plus auxiliary assumptions (about instruments, background conditions, etc.). When a prediction fails, logic alone cannot tell you which component to reject. Scientists routinely protect core theories by revising auxiliaries (predicting Neptune rather than abandoning Newton). This shows that falsification in practice is a matter of judgment, not automatic logical invalidation, which is a deeper challenge to Popper than any of the other options.

Question 2

A critic argues that psychotherapy is unscientific because practitioners can interpret any patient outcome as consistent with their theoretical framework. A Lakatosian would assess this claim by asking:

• A. Whether psychotherapy is practiced by licensed and credentialed professionals
• B. Whether the therapeutic research programme generates novel predictions that are subsequently confirmed, or merely adds protective assumptions after the fact to accommodate failures
• C. Whether the therapy's practitioners believe their framework is falsifiable in principle
• D. Whether the therapy has been endorsed by the current scientific paradigm's puzzle-solving community

Answer: (B)

For Lakatos, the key distinction is between a *progressive* research programme (one that generates new, confirmed predictions) and a *degenerative* one (one that only adds epicycles to protect a core that keeps failing). A therapy that accommodates every outcome by reinterpreting it after the fact, without making advance predictions that are then confirmed, is degenerative in Lakatos's sense — not because it is unfalsifiable in Popper's sense, but because it produces no new empirical content.

Question 3

According to Popper, a theory that can accommodate any possible observation — that is rarely contradicted by evidence — is the most powerful kind of scientific theory.

• T. True
• F. False

Answer: False

This is precisely what Popper argued *against*. For him, a theory that can accommodate anything predicts nothing — it has no empirical content. Popper worried about Freudian psychoanalysis and Adlerian psychology for exactly this reason: any patient behavior could be interpreted as confirming either theory. Scientific theories must be bold enough to risk falsification. The appearance of explaining everything is, for Popper, evidence of unscientific status rather than strength.

Question 4

The failure to find a single sufficient criterion for demarcating science from non-science means the demarcation project has produced no practically useful tools for evaluating whether a field counts as scientific.

• T. True
• F. False

Answer: False

The debate has produced a rich diagnostic toolkit: falsifiability, testability, novel predictive success, progressive research programmes, intersubjective verifiability. No single criterion works universally, but applied together they allow nuanced assessment of candidate disciplines. Astrology, for instance, scores poorly on multiple dimensions simultaneously — its predictions are vague, it insulates itself from failure, it generates no progressive research, and it invokes no known mechanisms. The absence of a bright line does not mean the tools are useless.

Question 5

Why is the inability to find a single universal criterion for scientific status not a failure of the demarcation project?

Model answer: Because the demarcation project's practical value lies in generating multiple diagnostic criteria — falsifiability, novel prediction, progressive research programmes, intersubjective verifiability — that can be applied simultaneously. Paradigmatic sciences score high on most of these; pseudosciences typically score low on several. The project reveals that 'science' is not a category with a sharp edge but a cluster concept, and the diagnostic tools it produced allow careful, multi-dimensional assessment of any candidate discipline.

The analogy to family resemblance concepts is useful: just as there is no single feature all games share, there is no single feature all sciences share. The demarcation debate clarified this and identified which overlapping features are characteristic. That is genuine philosophical progress, even without a knock-down criterion.