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Hypotheses/Feyerabend: Hypotheses can be used that contradict well-confirmed theories and/or experimental results. The sciences can be promoted by proceeding contrainductively.
Ad-Hoc Hypotheses/Feyerabend: initial difficulties caused by the change are mitigated by ad-hoc hypotheses, which therefore sometimes have a positive function. They give new theories a break, and they indicate the direction of future research.
Lakatos: pro ad-hoc theories.
Wider den Methodenzwang Frankfurt 1997
Erkenntnis für freie Menschen Frankfurt 1979