The IIA Reform Accelerator aims to expedite the modernization of the existing stock of old-generation investment treaties. It operationalizes the idea of gradual innovation by focusing on the reform of the substantive provisions of IIAs in selected key areas. The Accelerator focuses on eight IIA provisions that are most in need of reform, and that have seen a clear reform trend in line with the sustainable development goals (SDGs) and towards safeguarding the State’s right to regulate in IIAs. The Accelerator provides examples of how the model provisions were applied in recent treaties and explains their object, purpose, and application in the commentary. The provisions can be used to negotiate new treaties or to amend or reform existing ones. The original text is in English and was translated into the local languages of the Western Balkans.