Most models have focused on single classes of
conversational implicature. What problems
would arise in integrating them? It is pointless
to consider integrating dierent classes of conversational
implicature, based on Grice's taxonomy. His
taxonomy is not of a suciently concrete nature to
be fruitfully applied to real implementations. There
are signicant issues in integrating dierent types
of inference mechanisms in conversation, but Grice's
categories are irrelevant to these issues.