A collection of previously unpublished papers focusing on Centering Theory, which has been developed in the context of computational linguistics and cognitive science. The authors' focus on naturally occuring data is part of a general trend towards empiricism in research on computational models of discourse. This volume... represents an important follow-up to the work on centering carried out in the late eighties and early nineties, and in this context it is a timely collection of a number of interesting contributions.