It would be wrong to assume that one must stay with a research programme until it has exhausted all its heuristic power, that one must not introduce a rival programme before everybody agrees that the point of degeneration has probably been reached.
Imre Lakatos
Research programmes, besides their negative heuristic, are also characterized by their positive heuristic.
Imre Lakatos
The materialistic point of view in psychology can claim, at best, only the value of an heuristic hypothesis.
Wilhelm Wundt
The positive heuristic of the programme saves the scientist from becoming confused by the ocean of anomalies.
Imre Lakatos
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