This chapter emphasizes the diversity of local interpretive norms as well as putatively culture-specific ideas about the relative transparency or opacity of other minds. It deals with a quick review of some of the ways in which intersubjectivity has been conceptualized before turning to sketch the structures of interaction through which it is constituted. The human form of intersubjectivity, centrally involves joint attention and shared intentionality thus allowing two or more individuals to focus on the same object while simultaneously attending to the attention of the other. A series of positions within architecture of intersubjectivity: same turn/first position, transition space, next turn/second position, third position is identified. These are arranged serially as positions within an unfolding course of talk and their organization reflect then the fact that understanding, in interaction, is not static but in a certain basic sense emergent. The chapter discusses issues of cross-cultural diversity and species-uniqueness.