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a reformulation of a phenomenon in such a way that
its elements appear operationally connected in its generation.
(Maturana and Varela, 1979)
Any theory that logically implies or any system that reconstructs or generates what has in fact been observed. The theory or system used in this process constitutes the explanans or the premises of the explanation. The thing to be explained is the explanandum or conclusion of the explanation. Explanation establishes a formal construct on top of existing data, whereas prediction goes beyond them (see generative, reconstructibility). (Krippendorff)