On what dimensions do computing platforms compete, and how does that competition help or hinder the deployment of technical standards? What principles shape choices over platform governance, and how do those choices shape competitive outcomes? In this line of research, Professor Greenstein examines the many ways in which competitive rivalry influences the promulgation of standards, and which dimensions—such as proprietary and nonproprietary platform governance—really matter. His most recent work in this area focuses on smart phone platform competition.