Communicating with multiple addressees poses a problem for speakers: Each addressee necessarily comes to the conversation with a different perspective-different knowledge, different beliefs, and a distinct physical context. Despite the ubiquity of multiparty conversation in everyday life, little is known about the processes by which speakers design language in multiparty conversation. While prior evidence demonstrates that speakers design utterances to accommodate addressee knowledge in multiparty conversation, it is unknown if and how speakers encode and combine different types of perspective information. Here we test whether speakers encode the perspective of multiple addressees, and then simultaneously consider their knowledge and physical context during referential design in a three-party conversation. Analyses of referential form-expression length, disfluency, and elaboration rate-in an interactive multiparty conversation demonstrate that speakers do take into consideration both addressee knowledge and physical context when designing utterances, consistent with a knowledge-scene integration view. These findings point to an audience design process that takes as input multiple types of representations about the perspectives of multiple addressees, and that bases the informational content of the to-be-designed utterance on a combination of the perspectives of the intended addressees. process involves considerations of the likely knowledge and beliefs of a single addressee -tailoring what is said to their perspective. When we consider the case of multiparty conversation, however, this process becomes decidedly more complex. Consider that each individual necessarily brings to the conversation different knowledge and beliefs (due to different life experiences), and a distinct physical context (as two people cannot occupy the same place at the same time). Thus, when simultaneously addressing two or more addressees, the speaker must design what they will say for a group of addressees who have different communicative needs due to their distinct perspectives. The current literature contains only a small number of studies examining audience design in multiparty conversation, and as a result, very little is known about if or how this process unfolds. In a new line of research, we have begun to ask basic mechanistic questions about how speakers design language for groups of addressees who differ in their background knowledge for the topic at hand. The present research builds on these findings to explore if and how speakers take into consideration two different types of perspective informationknowledge and physical context-in multiparty audience design.A classic paradigm for examining audience design is the referential communication task, in which pairs of participants work together to rearrange a set of abstract images multiple times (Krauss & Weinheimer, 1964, 1966. In this task, the conversational partners jointly create brief labels for these images across the course of the conversation