Marilyn A. Walker Diane J. Litman Candace A. Kamm Alicia Abella PARADISE: A Framework for Evaluating Spoken Dialogue Agents http://arxiv.org/abs/cmp-lg/9704004 1997 CoRR cmp-lg/9704004 db/journals/corr/corr9704.html#cmp-lg-9704004 informal publication