This paper argues that practitioners and researchers in underdeveloped countries should organize themselves into teams to find and share research and experience-based information about factors that influence the quality of teaching. The teams would compile locally-developed knowledge about three topics: What teaching practices are most effective in classrooms? How do teachers who use those practices learn them? How and what should teacher training institutions teach teachers so that they will use effective practices? The paper briefly reviews published research to argue that the answers to the latter two questions are not yet fully developed, and especially not for underdeveloped countries.