The different senses of the term information in physical, biological and social interpretations, and the possibility of connections between them, are addressed. Special attention is paid to Hofkirchner's Unified Theory of Information (UTI), proposing an integrated view in which the notion of information gets additional properties as one moves from the physical to the biological and the social realms. The paper aims to discuss these issues.
UTI is compared to other views of information, especially to two theories complementing several ideas of it: the theory of the hypertextual documental universe (“docuverse”) and the theory of integrative levels of reality. Two alternative applications of the complex of these three theories are discussed: a pragmatical, hermeneutic one, and a more ambitious realist, ontological one. The latter can be extended until considering information (“bit”) together with matter-energy (“it”) as a fundamental element in the world. Problems and opportunities with each view are discussed.
It is found that the common ground for all three theories is an evolutionary approach, paying attention to the phylogenetic connections between the different meanings of information.
Other theories of information, like Leontiev's, are not discussed as not especially related to the focus of the approach.
The paper builds on previously unnoticed affinities between different families of information-related theories, showing how each of them can provide fruitful complements to the other ones in clarifying the nature of information.
Although the whole paper was developed by the authors in full collaboration, responsibility is mainly by Riccardo Ridi for Sections 1, 3 and 6, by Claudio Gnoli for Sections 4 and 7, and by both for Sections 2 and 5.
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