Real-world laboratories (RwLs) are a form of transdisciplinary research that facilitates learning processes as part of its transformative objectives. Nevertheless, little conceptual effort has been put into the understanding, planning, and evaluation of the learning dimension of RwL work. This paper applies a systematic approach from the discourse on education for sustainable development (ESD) to differentiate three perspectives on the various learning processes occurring in RwLs and exemplifies them with experiences from the RwL Urban Transition Lab 131 in Karlsruhe.