An Evaluation of Alternative Strategies for Implementing Dialogue Policies Using Statistical Classification and Hand-Authored Rules David DeVault author Anton Leuski author Kenji Sagae author 2011-11 text Proceedings of 5th International Joint Conference on Natural Language Processing Haifeng Wang editor David Yarowsky editor Asian Federation of Natural Language Processing Chiang Mai, Thailand conference publication devault-etal-2011-evaluation https://aclanthology.org/I11-1150/ 2011-11 1341 1345