Chapters 6 and 7 [the chapters preceding this one in the original publication] outline a perspective to conversation that focuses on conversational inference and on participants' use of prosodic and phonetic perceptions as well as on interpretive preferences learned through previous communicative experience to negotiate frames of interpretation. Using this perspective we can account for both shared grammatical knowledge and for differences in communicative style that characterize our modern culturally diverse societies.
This approach to speaking has both theoretical and practical significance. On the theoretical level it suggests a way of carrying out Garfinkel's program for studying naturally organized activities through language without relying on a priori and generally untestable assumptions about what is or is not culturally appropriate. Although it might seem at first glance that contextualization cues are surface phenomena, their systematic analysis can lay the foundation for research strategies to gain insights into otherwise inaccessible symbolic processes of interpretation.
On the practical level, the study of conversational inference may lead to an explanation for the endemic and increasingly serious communication problems that affect private and public affairs in our society. We can begin to see why individuals who speak English well and have no difficulty in producing grammatical English sentences may nevertheless differ significantly in what they perceive as meaningful discourse cues. Accordingly, their assumptions about what information is to be conveyed, how it is to be ordered and put into words and their ability to fill in the unverbalized information they need to make sense of what transpires may also vary. This may lead to misunderstandings that go unnoticed in the course of an interaction, but can be revealed and studied empirically through conversational analysis.
The main purpose of earlier chapters was to illustrate the nature of the cues and the inferential mechanisms involved. To that end, the discussion largely relied on examples