Science is a great time to focus on language development in the elementary classroom. Participation in science requires that students use language to present claims, engage in argumentation, and partake in science and engineering process skills. Over the years, the authors have noted the importance of vocabulary in students' ability to participate in the language of science. Research also notes a clear link between children's early experiences, including exposure to rich vocabulary, and academic success (Duncan et al. 2007). The authors decided to examine ways to effectively integrate vocabulary instruction in science and set out to develop a list of core principles to help guide a cross-curricular integration. The goal was to support student vocabulary development, which in turn would support the development of science language and the ability of all students to fully participate in science.