An anomalous planetary orbit threatens the Newtonian research program. Scientists hypothesize an undiscovered planet whose gravitational pull would explain the anomaly. Astronomers search and find the planet at the predicted location. According to Lakatos, how should this protective-belt adjustment be evaluated?
AThe adjustment was degenerating — scientists should have abandoned Newton's Laws at the first anomaly rather than adding auxiliary hypotheses
BThe adjustment was ad hoc — it was invented specifically to explain a known anomaly
CThe adjustment was progressive — it successfully predicted a novel fact (the planet's existence and location) that was subsequently confirmed, expanding the program's empirical content
DThe evaluation is impossible — Lakatos's framework only applies to transitions between entire research programs, not individual auxiliary adjustments
This is Lakatos's canonical example of a progressive auxiliary hypothesis — the discovery of Neptune from Newtonian predictions. The adjustment was progressive rather than ad hoc because it did not merely accommodate the known anomaly; it generated a new, independently testable prediction (the planet exists at position X) that was then confirmed. This expanded the program's empirical content. An ad hoc adjustment would have explained the anomaly without predicting anything new — for instance, postulating an undetectable medium that only affected that orbit.
Question 2 Multiple Choice
Ptolemaic astronomers repeatedly modified the system of epicycles to accommodate newly observed planetary positions. No modification ever predicted a previously unknown astronomical phenomenon. According to Lakatos, this pattern shows the Ptolemaic program is:
AProgressive — it successfully explains each new astronomical observation by adding the appropriate epicycles
BDegenerating — it only accommodates known observations without generating novel predictions, exhibiting ad hoc adjustment
CIn a phase of normal science — adjusting auxiliary hypotheses within an established framework is always rational
DFalsified — Lakatos holds that research programs should be abandoned as soon as anomalies appear
Accommodating known observations is not enough for Lakatos; a progressive program must predict genuinely new phenomena. The Ptolemaic program could always be patched to fit any orbit by adding epicycles, but the patches never revealed anything unexpected. This is the mark of a degenerating program: its theoretical content grows only retrospectively, absorbing what we already know rather than pushing into new empirical territory. Lakatos explicitly contrasts this with the progressive Newtonian program that predicted Neptune — the Ptolemaic system never had a comparable predictive triumph.
Question 3 True / False
According to Lakatos, scientists who continue working within a research program that faces persistent anomalies are acting irrationally, since anomalies constitute refutations of the program.
TTrue
FFalse
Answer: False
This is Popper's view, not Lakatos's. One of Lakatos's central arguments against naive falsificationism is precisely that continuing with an anomaly-ridden program can be perfectly rational — if the program remains progressive (still generating confirmed novel predictions). Anomalies are part of the normal life of any research program and do not constitute decisive refutations. Scientists switch programs rationally only when the current program has become genuinely degenerating AND a better progressive alternative is available. Demanding immediate abandonment at the first anomaly would have killed Newtonian mechanics in its infancy.
Question 4 True / False
For Lakatos, the hard core of a research program is deliberately protected from refutation by directing all empirical tests toward the auxiliary hypotheses in the protective belt.
TTrue
FFalse
Answer: True
This is Lakatos's key structural claim. The hard core consists of the fundamental theoretical commitments that scientists treat as non-negotiable — Newton's laws, Darwin's selection principles, etc. By methodological decision (not necessity), scientists protect the hard core: when a prediction fails, they look for ways to adjust the auxiliary hypotheses (initial conditions, measurement assumptions, background theories) before questioning the core. This deliberate protective strategy is what makes research programs differ from isolated theories, and it explains why Popperian falsification of individual theories misses how science actually works.
Question 5 Short Answer
What is the difference between a 'progressive' and a 'degenerating' research program in Lakatos's framework, and why does this distinction matter for scientific rationality?
Think about your answer, then reveal below.
Model answer: A progressive research program generates new theories with genuinely novel predictive content — it makes successful predictions about phenomena that were not used to construct those theories, expanding its empirical scope. A degenerating program only accommodates already-known observations through ad hoc adjustments that generate no new testable predictions. The distinction matters for scientific rationality because it gives a criterion for rational theory choice that Popper's falsificationism lacked (single anomalies don't refute) while avoiding Kuhn's sociological relativism (paradigm shifts are not purely gestalt switches). Scientists can rationally continue with a currently anomalous program that remains progressive, and rationally switch to a better program when the old one has become degenerating.
The key is that 'progressive' is defined prospectively — a prediction made before the confirming observation — not retrospectively. Any program can accommodate past data; the question is whether it leads you to discover new things. This is why the Neptune case is paradigmatic for Lakatos: the planet was predicted, searched for, and found. A program that could only explain Neptune after it was already known would not count as progressive by this standard.