This chapter gives the membership of the Commissions (listed by Commission number), as they were affiliated to the Divisions in force until the end of the XVIIIth General Assembly. As a result of the adoption of Resolution B4 by this Assembly, a new Divisional structure was established (see Chapters II and IV of these Transactions), to take effect on 1 September 2012. This new structure will affect the way Commissions are affiliated to Divisions in the next triennium (2012–2015).