Terrific op-ed in yesterday’s New York Times by Jeff Stein, national security editor of Congressional Quarterly. He’s been conducting a little experiment…

FOR the past several months, I’ve been wrapping up lengthy interviews with Washington counterterrorism officials with a fundamental question: “Do you know the difference between a Sunni and a Shiite?”

A “gotcha” question? Perhaps. But if knowing your enemy is the most basic rule of war, I don’t think it’s out of bounds. And as I quickly explain to my subjects, I’m not looking for theological explanations, just the basics: Who’s on what side today, and what does each want?

Here are some of the answers:

A few weeks ago, I took the F.B.I.’s temperature again. At the end of a long interview, I asked Willie Hulon, chief of the bureau’s new national security branch, whether he thought that it was important for a man in his position to know the difference between Sunnis and Shiites. “Yes, sure, it’s right to know the difference,” he said. “It’s important to know who your targets are.”

That was a big advance over 2005. So next I asked him if he could tell me the difference. He was flummoxed. “The basics goes back to their beliefs and who they were following,” he said. “And the conflicts between the Sunnis and the Shia and the difference between who they were following.”

A member of the House intelligence committee:

Mr. Everett responded with a low chuckle. He thought for a moment: “One’s in one location, another’s in another location. No, to be honest with you, I don’t know. I thought it was differences in their religion, different families or something.”

Another committee member:

“Do I?” she asked me. A look of concentration came over her face. “You know, I should.” She took a stab at it: “It’s a difference in their fundamental religious beliefs. The Sunni are more radical than the Shia. Or vice versa. But I think it’s the Sunnis who’re more radical than the Shia.”

Now we’re not talking theology. Stein’s asking his repondents who’s who right now. Do they know that Hezbollah is Shiite? That Osama bin Laden is Sunni? Stein says that some of his interviewees are able to answer these questions easily. But all too many, he says, “don’t have a clue.”

“How can they do their job,” Stein asks, “without knowing the basics?”