Introduction--Open Problems on Reference

After briefly introducing the topic of reference, which has a long tradition but did not become a major issue until the last century, when language started to occupy center-stage in philosophy, and after mentioning some of the open problems that the semantic revolution promoted by Saul Kripke and others in the late 1960s and early 1970s left us, which are dealt with in the volume, I offer a preview of the papers collected in the latter, explaining how the volume is organized and how the papers relate to one another.