If you can choose between two possibilities, you can act in two ways: either you say ‘yes’ to one of the possibilities, or explicitly ‘no’. In the latter case you choose to what you said neither ‘yes’, nor ‘no’. If there are more possibilities, then the procedure is similar: either a 'yes' will immediately select one of the possibilities, or a series of ‘no’s will lead to a choice where there are only two possibilities to choose from.

With ‘no’ or a series of ‘no’s, the choice meets Tarski’s and, based on that, Karl Popper’s method: according to their statements, the criterion of truth does not exist, so the approach to the truth is through the exclusion of falsity. Karl Popper called this "the critical search for truth". It is important to know that while there is no criterion of truth, this does not mean the denial of the existence of truth.

Also the choice between scientific theories takes place through the exclusion of false or pointless theories. For this reason, the refutability – the falsifiability – is a more important criterion of a scientific theory than the demonstrability of the theory according to Karl Popper.

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