This document summarizes key points from Chapter 9 of Diffusion of Innovations, which focuses on the role of change agents in the diffusion of innovations. Some main topics covered include targeting audiences, using communication campaigns, and working with opinion leaders. The chapter defines what a change agent is and lists the two main problems they face as well as their seven roles. It also provides eight generalizations about factors that influence a change agent's success and discusses centralized vs decentralized diffusion systems.