PhD Thesis written by Roser Morante Vallejo at Tilburg University under the supervision of Harry Bunt (Tilburg Univ.). The thesis defence (viva voce) took place before the committee formed by doctors David Traum (Univ. of Southern California), Michael McTear (Univ. of Ulster), Reinhard Muskens (Tilburg Univ.), Emiel Krahmer (Tilburg Univ.) and Robbert-Jan Beun (Utrecht Univ.) on the 3rd of Dece...

interaction systems engaging in communicative action using a variety of media. There was some interesting discussion about how the resources and constraints of machine communicative partners differ from humanhuman communication. Another important issue was the role of context, which motivated a joint session with the symposium on Context in Knowledge Representation and Natural Language Processi...