: Mobile learning has left the status of a new born child. It is time now to implement some structure into the complex and various activities by a framework presented in this paper. The framework classifies mobile learning in the five categories free, formalised, digital, physical, and informal context. Examples for each category are given. Overviewing the existing projects, the framework allows some analysis about missed out potentials of mobile learning. It helps to avoid the repeated reinvention of the wheel. 1 How to Classify Mobile Learning Mobile learning is a rather new term which received ongoing attention during the new millenium when mobile technology started its strong impact on society. Until now there were only few attempts from literature reviews to give mobile learning some meta-structure which allowed systematic analysis. Some early literature reviews are limited to a collection and description of diverse bundles of activities and projects [Tri03, LNB03], but without an...