The decision to prepare a Fifth Assessment Report (AR5) was taken by the members of the IPC at its 28th Session (09-10 April 2008, Budapest, Hungary).
Following the election of the new IPC Bureau at the 29th Session of the IPC (31 August - 04 September 2008, Geneva, Switzerland) and discussions about
future IPC activities at the 30th Session of the IPC (21-23 April 2009, Antalya, Turkey), a Scoping Meeting was held (13-17 July 2009, Venice, Italy)
to develop the scope and outline of the AR5. The resulting outlines
for the three Working Group contributions to the AR5 were approved by the 31st Session of the IPC in Bali (26-29 October 2009).