Here is a further excerpt from the article.
"Because computer modeling work is normally accompanied by physical tests of the components that go into a nuclear weapon, it would also buttress IAEA fears outlined in detail in November that Tehran is advancing its weapons research on multiple fronts".
The question is, what is Iran trying to accomplish? What is their end game? Are they rational actors or a fanatical regime of "12th imamers" who are trying to bring on an armageddon? A war with Iran could have dire consequences, but a nuclear armed Iran could be catastrophic.