Abstract

This special issue of Minds and Machines contains a number of responses to Luciano Floridi’s groundbreaking Philosophy of Information (Oxford 2011). The essays contained here have been grouped by topic; essays 1–5 concern epistemological features of Floridi’s approach, and essays 6–8 address his metaphysics.In “On Floridi’s Method of Levels ofion”, Jan van Leeuwen addresses Floridi’s operational definition of a level of abstraction. Emphasizing the link between Floridi’s notion of abstraction and that used in computer science, van Leeuven notes that the method of levels of abstraction may require supplementation in the form of annotation. Annotations, which exist “outside” the formal limits of the levels of abstraction to which they are attached, specify what perspective should be taken towards those levels. Annotations so understood both facilitate the expression of semantic information and elucidate the relationship between levels of abstraction. van Leeuwen then uses a case