This issue of «Teoria» has been divided into two sections. The first includes some of the contributions that were selected in response to the call for papers on the subject of The Concept of Trust. In the second section of this issue we have published some papers that were presented at the International Convention of Philosophy, Knowledge, and the Sciences, held at the UNISER, University of Pistoia, on 4th and 5th June 2018. The result, in both these sections, is a series of essays that have not only been evaluated and discussed for publication purposes through a double blind peer review process, but which, moreover, are the result of comparison and common debate developed between scholars, both young and old, who are specialised in this field. A similar format will also be adopted for the next issue of «Teoria», which will feature the second part of the papers selected in relation to the theme of trust. These will deal with the question from a more specifically historical point of view, analysing some important authors on this topic.