Though wilderness therapy programs are growing in number and popularity, the theoretical basis for distinguishing wilderness therapy from traditional therapeutic modalities is lacking. Existing models describing the wilderness therapy process have been stage-based, meaning the process has been conceptualized as sequential and discrete. Lost in this conceptualization of the wilderness therapy process is the dynamic and interrelated nature of therapeutic factors reasoned to be present at all times and to varying degrees. To address the limitations of stage based models and the lack of a strong theoretical basis in wilderness therapy, a concurrent model of the wilderness therapy process is proposed. This proposed model consists of three factors believed to be unique to the wilderness therapy milieu: Wilderness, Physical Self, and Social Self. The constituents of each of these factors are detailed and theoretical rationale for inclusion provided. In addition hypotheses about the intensity of each of these factors are discussed as a function of the temporal progression of the wilderness experience (e.g. entrance into wilderness program, exiting wilderness program). Advantages of the proposed model as well as suggestions for model testing and refinement are included. (Contains 2 figures.)