The method used by most inventors since the 19th century can be characterized as the blind trial and error method: possible solutions were chosen randomly.
No rules of idea generating were used and, in principle, any idea could be accepted. No criteria were applied either, which forced the inventor into multiple experiments in order to evaluate each possibility.
The inventive process was a quid pro quo, reciprocal exchange, where ignorance was being exchanged for time (“the less we know, the longer we search”).
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