The importance of argument in science teaching is a hot topic. Educators are told "doing science" doesn't just involve following a scientific method; it involves the restructuring and refinement of ideas through negotiation and critique with other people. Understanding the importance of argument is one thing, but even for the enthusiastic and educated teacher, getting students to engage in meaningful peer-to-peer negotiation and critique can be a challenge. Thinking about what negotiation is and how language can foster negotiation can assist teachers in creating learning environments that support peer-topeer negotiation. Using the word "negotiation" emphasizes to students and teachers that this is a process they will go through together. This article describes ways to encourage this process.