The last decade has brought about a major change in higher education. Course design has developed from a craftsmanship-like process to a structured production, which involves interdisciplinary teams and requires more complex communication skills. This conceptual article introduces E[superscript 2]ML--Educational Environment Modeling Language--a visual language for supporting complex instructional design processes. E[superscript 2]ML can be used for visualizing the intermediate and final results of design, thus providing documentation in a shared language that can enhance team communication, improve design, and contribute to the development of high-quality instruction. The language and its formal features are presented from a conceptual point of view and illustrated by examples. The main results of a first evaluation study are reported, and the exploitation of E[superscript 2]ML in practice as well as its costs and benefits are critically discussed.