What is Structurality

Contemporary society is an information society, based on Information Sciences and Information Technology. Technical information is therefore the most accessed and further promoted. This article aims to push toward completeness the study of information by analyzing the variety of information types and by presenting the hierarchy of information levels of existence. Specific features of natural, social and human information are highlighted. The internal information structure of distinct domains and levels of natural and social existence is explored. Information types such as structural information, systemic information, functional information or free information are characterized and defined, from various perspectives. An interdisciplinary study of information is thus accomplished, by using findings from several scientific and philosophical disciplines, from Information Epistemology or Information Aesthetics to Neuroinformatics and Neurorobotics. New research topics such as information values, information efficiency and information responsibility are proposed at the end of article.