Dialogue acts are rational plans .
Despite this popularity of the concept, there are still a number of issues that present significant challenges for creating a taxonomy of dialogue acts that can be understood and used by other groups. Dialogue acts are rational plans . For a fixed set of domains, this system is able to accept nearly unconstrained spontaneous language as input, and react in a cooperative way. But in this case the acceptance of the assertion p would be blocked as well, which is counterintuitive. M. D. Sadek.