February 20, 2006 dialogue systems what for? (phone, hands-free, could be multimodal) early dialogue systems ELIZA no understanding of language canned responses, templates, simple patterning matching PARRY, SHRDLU dialogue facts basic facts (turn-taking, adjacency pairs, common ground, backchannels) Gricean maxims (rules of conversation) four maxims: quantity, quality, relevance, manner flouting a maxim (disobeying on purpose to be polite or to be funny) speech acts kinds of speech acts direct vs. indirect (does the form match the meaning?)