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.

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

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.

If even in science there is no a way of judging a theory but by assessing the number, faith and vocal energy of its supporters, then this must be even more so in the social sciences: truth lies in power.

Research programmes, besides their negative heuristic, are also characterized by their positive heuristic.

The classical example of a successful research programme is Newton's gravitational theory: possibly the most successful research programme ever.

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