Peace is an extremely important value for humankind, yet it has been largely ignored by the computing and human-computer interaction community. This paper seeks to begin a discussion within the human-computer interaction community on how we can design technologies that have peace as an explicit goal. To begin this discussion, I review empirical studies on the factors that contribute to conflict and those that make conflict less likely. Based on this, I identify areas where human-computer interaction research has already contributed to prevent conflict and promote peace, and open areas where our community can make a positive difference. Keywords Peace, causes of conflict, software, technology, empirical studies, discussion. ACM Classification Keywords H5.m. Information interfaces and presentation (e.g.,