ISA is continuing their series of scientific literature reviews, with the goal of identifying the frontiers of arboriculture and disseminating this knowledge to the profession worldwide. Therefore, ISA is now accepting proposals for literature reviews on the topics of tree benefits and public awareness, plant health care, urban and community forestry, and mature tree care and preservation. This Request for Proposals is for the performance of a comprehensive literature review of all research relevant to the proposed subject. All proposals must be received by the close of business November 18, 2016.