Multilateral Agencies: Alliance of Small Island States (AOSIS) - Sustainable Development Advisor The Alliance of Small Island States (AOSIS) is a coalition of small island and low-lying coastal countries that share similar development challenges and concerns, especially their vulnerability to the adverse effects of global climate change. AOSIS's Sustainable Development Adviser will guide the preparation of SIDS' substantive position statements ahead of the SIDS conference 2014 and lead post-conference negotiations to ensure SIDS' views are represented in the Sustainable Development Goals.