EU administrative law is an instrument aimed at steering social processes that, in its current state, presents some important flaws. This paper departs from the assumption that a way to improve it is a more system-oriented doctrinal approach. Specifically, it explores how this task should be undertaken. After describing its theoretical and methodological foundations, it identifies next some of the most relevant building blocks on which systematization of EU administrative law has to unfold. In this respect, a distinction is made between elements of a substantive nature –constitutional principles, legislative goals, and discretional criteria– and elements of a structural nature –forms of organization, types of procedure, and legal forms of action.