  I propose a model for determining the hearer's attentional state which
depends solely on a list of salient discourse entities (S-list). The ordering
among the elements of the S-list covers also the function of the
backward-looking center in the centering model. The ranking criteria for the
S-list are based on the distinction between hearer-old and hearer-new discourse
entities and incorporate preferences for inter- and intra-sentential anaphora.
The model is the basis for an algorithm which operates incrementally, word by
word.
