While much attention has been paid to what students learn in outdoor education settings, little has been paid to the process through which that learning occurs. The purpose of this study was to identify the mechanisms through which students report learning one of six targeted objectives on courses offered by the National Outdoor Leadership School. Results suggested five broad domains through which learning occurs: structure-oriented mechanisms; instructor-oriented mechanisms; student-oriented mechanisms; student- and instructor-oriented mechanisms; and mechanisms that are a result of environmental qualities. The relative importance of each of these domains is discussed, as are recommendations for practice.