There is no falsification before the emergence of a better theory.

That sometimes clear ... and sometimes vague stuff ... which is ... mathematics.

It is not that we propose a theory and Nature may shout NO; rather, we propose a maze of theories, and Nature may shout INCONSISTENT.

The positive heuristic of the programme saves the scientist from becoming confused by the ocean of anomalies.

Blind commitment to a theory is not an intellectual virtue: it is an intellectual crime.

One may rationally stick to a degenerating research programme until it is overtaken by a rival and even after. What one must not do is to deny its poor public record... It is perfectly rational to play a risky game: what is irrational is to deceive oneself about the risk.

The great scientific achievements are research programmes which can be evaluated in terms of progressive and degenerative problemshifts; and scientific revolutions consist of one research programme superceding (overtaking in progress) another. This methodology offers a new rational reconstruction of science.