Acer joined the Public-Private Alliance for Responsible Minerals Trade (PPA), and began using the version 2 RBA Due Diligence tool to launch surveys of our suppliers regarding smelting plants, including the use and sources of 3TG minerals (tungsten, tin, tantalite, and gold), along with gaining feedback through surveys of smelters. Through review and analysis of non-conflict mineral surveys conducted by suppliers in 2013, we have been able to identify a list of smelters/refiners that use conflict minerals in our supply chain. For more details, please see the 2013 Conflict Mineral Report and 2014 Conflict Mineral Report.