Co-authored by Stacy C. Marsella, Jafar Adibi, Yaser Al-Onaizan, Ion Muslea, Marcello Tallis, and Milind Tambe, our paper titled “On being a teammate: Experiences acquired in the design of RoboCup teams” in the International Conference on Autonomous Agents was invited for publication in the best of Agents 1999 special issue of the journal Autonomous Agents and Multi-Agent Systems.