Gestures are an important form of communication for people. Can predictive modeling suggest how gestures communicate? This chapter considers this, with a focus on the studies Riseborough, M. G. (1981) Physiographic gestures as de- coding facilitators: Three experiments exploring a neglected facet of communication, and Goldin-Meadow, S., Kim, S., & Singer, M. (1999) What the teacher’s hands tell the student’s mind about math.