But observers say there are plenty of unknowns, including whether Iran will cooperate with the tentative deal and to what extent the IAEA will be able to monitor Iran's nuclear efforts.

VOA: standard.2009.10.19

"Even when we know the result of the election, we may not know what the result is in terms of government -- who will successfully make a deal with who to form what sort of government."

VOA: standard.2010.05.05

"What President Obama is going to be doing at the summit is to be working with President Calderon and Prime Minister Harper to discuss what we are doing collaboratively to deal with the challenge, making sure that our public health departments and officials are working closely together,".

VOA: standard.2009.08.10