At a time when the threat of nuclear arms is again increasing, the Norwegian Nobel Committee wishes to underline that this threat must be met through the broadest possible international cooperation. This principle finds its clearest expression today in the work of the IAEA and its director general. In the nuclear non-proliferation regime, it is the IAEA which ensures that nuclear energy is not misused for military purposes, and the director general has stood out as an unafraid advocate of new measures to strengthen that regime.