As the number of available media increases, teachers and learners have to make a sound choice, which media should be used for what purpose. The paper presents the Theory of Media Synchronicity of Dennis and Valaccich and explores its potential contribution to group collaboration and learning. While the popular Media Richness Theory regards a thorough understanding of communication partners as sole problem to be solved by adequate media choice, the Theory of Media Synchronicity also includes the issues of group productivity. These problems become important when group sizes increases, as it is the case in traditional learning. The Theory of Media Synchronicity therefore has the potential to contribute to more informed media choice in learning, but very likely needs to be further developed to hold up to this promise. The paper includes specific conclusions for media choice in learning deduced form the general propositions of the Theory of Media Synchronicity.