This is a review of a decoupling mechanism approved by the Oregon PUC for the Northwest Natural gas company. This report covers theoretical evaluations of DMN and WARM, or what we would expect to happen given the calculations contained in the mechanisms, it presents data and analysis regarding the effects of DMN, including revenue effects, changes in marketing efforts, organizational changes, financial effects, and service quality issues, and compares DMN to other rate mechanisms that may be able to achieve similar goals.