While the notion of a cooperative response has been the focus of considerable research in natural language dialogue systems, there has been little empirical work demonstrating how such responses lead to more efficient, natural, or successful dialogues. This paper presents an experimental evaluation of two alternative response strategies in TOOT, a spoken dialogue agent that allows users to access train schedules stored on the web via a telephone conversation. We compare the performance of two versions of TOOT (literal and cooperative), by having users carry out a set of tasks with each version. By using hypothesis testing methods, we.
