This article describes an instructional model that science teachers can use to promote and support student engagement in scientific argumentation. This model is called the evaluate-alternatives instructional model and it is grounded in current research on argumentation in science education (e.g., Berland and Reiser 2009; McNeill and Krajcik 2006; Osborne, Erduran, and Simon 2004; Sampson and Clark 2009; Sandoval and Reiser 2004). To illustrate how this model works inside the classroom, a lesson that was developed for an eighth-grade integrated science course is described. This lesson was designed to help students understand the transfer of energy and develop the abilities to do scientific inquiry. (Contains 7 figures.)