The Massachusetts Ocean Partnership is developing and applying several tools to support decision making during the implementation of and updates to the Massachusetts Ocean Management Plan. The tools include the Cumulative Impacts model and an ecosystem services tradeoff model developed by the University of California at Santa Barbara, the MIMES ecosystem service model developed by the University of Vermont and Boston University, and the MIDAS decision support interface developed by Boston University. This webinar will provide an overview of these tools, why they were selected, a demonstration of draft and final products, and how they are being applied in Massachusetts. We will also provide some lessons and recommendations for their continued development and potential application within the marine spatial planning context. Learn more about the Massachusetts Ocean Partnership and its work at http://massoceanpartnership.org/.