Contributing to conversation, it is proposed, is accomplished in two phases. In the presentation phase, one participant ordinarily presents a stretch of speech intended to specify the content of his or her contribution. In the acceptance phase, all the participants work together to establish the mutual belief that everyone else has understood that content well enough for current purposes. The two phases together constitute a unit of conversation we call a contribution. The two phases may each have contributions embedded within them, so conversations consist of both sequential and hierarchical arrangements of contributions. As evidence for these proposals, we examine four types of contributions that occurred in directory enquiries of the telephone company. From this and other evidence, we argue that contributions appear to be a general feature of conversations.
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