The NIE left open the possibility that Iran could continue its weapons-relevant activities. With four years of additional perspective, the latest IAEA report gives greater detail on the weapons work that Iran did prior to 2003, then updates the available information on what lesser work occurred after 2003. The new activities included:

- Engaging in experimental research, after 2003, on hemispherical initiation of high explosives.

- Further validation, after 2006, of a neutron initiator design.

- Conducting modeling studies, in 2008 and 2009, that could determine the yield of a nuclear explosion.

Carrying on scattered research activities does not amount to a full-fledged restart of an integrated weapons program. That type of activity still appears to have halted in 2003. The activities since seem more like Iran is refining its previous understanding of nuclear weapons design -- not breaking for a bomb.