We'll see if this agreement works, at this point Assad is no longer a legitimate leader for Syria, but still major questions on what happens if his regime falls. Iran and Russia will still support Assad to pursue their own interests as will Lebanese Hezbollah, so selectively providing arms and other aids to vetted insurgent groups may not be enough to turn the tide.

http://www.washingtonpost.com/world/...14b_story.html

U.S., allies agree on standards for which opposition groups in Syria will receive aid

The United States and its principal European and Arab allies have agreed on a unified way of providing Syrian rebel groups with aid, classifying them into those who should receive arms supplies and other assistance, those who are ineligible because of clear extremist ties, and those whose eligibility requires further discussion, according to U.S. and allied officials.
“The idea is that no country will act unilaterally and all will abide by the same understanding,” said one Arab official. The official called the listing a “living document” that will be constantly updated as rebel alliances shift.