stated their commitment to ensure a Syrian-led and Syrian-owned political transition based on the 2012 Geneva Communique in its entirety; agreed to support and work to implement a nationwide ceasefire in Syria to come into effect as soon as the representatives of the Syrian government and the opposition have begun initial steps towards the transition under UN auspices on the basis of the Geneva Communique; agreed on the need to convene Syrian government and opposition representatives in formal negotiations under UN auspices with a target date of 1 January 2016;[1] assigned UN special envoy for Syria, Staffan de Mistura, to decide who should represent the opposition in those negotiations;[19] reiterated that the Islamic State of Iraq and the Levant (Da'esh) as well as the Jabhat al-Nusra Front, and "other terrorist groups, as designated by the UN Security Council, and further, as agreed by the participants and endorsed by the UN Security Council, must be defeated";[1] gave Jordan the charge "to help develop among intelligence and military community representatives a common understanding of groups and individuals for possible determination as terrorists, with a target of completion by the beginning of the political process under UN auspices".[1]