Suicide bomb ers are not all alike . Palestinians prepare elaborate martyr videos before their killings and become celebrities afterward, while Iraqi Sunnis kill their fellow citizens in obscurity. In Afghanistan, the suicide bombers have their own distinction: They are known for their ineptness, often blowing themselves up without killing anyone else.

“They’re not efficient,” said Martha Crenshaw, a senior fellow at the Center for International Security and Cooperation (CISAC) at the Freeman Spogli Institute for International Studies. She arrived at Stanford this summer, after several decades of studying terrorism as a professor of government at Wesleyan University in Middletown, Conn.

Afghan suicide bombers tend to be poorer, younger and less educated than suicide bombers elsewhere, Crenshaw said during a recent CISAC seminar. She cited a United Nations report that accused the Taliban of strapping explosives to boys, despite a commitment not to recruit those too young to have facial hair. Promises of motorcycles and cell phones have been used as inducements.

One boy whose mission failed was interviewed by U.N. workers. “He somehow thought he would survive the attack and get to spend the money they had promised him, not quite understanding that he would not be there,” Crenshaw said in an interview following her talk.

In Afghanistan, as elsewhere, the person wearing the explosives belt or driving the car bomb is the least valuable person in the terror group, Crenshaw said. The key people are the bomb maker and the organizer: “They never send the bomb maker with the bomb.” In Israel, security officials target the bomb makers for assassination.

“It’s the organization that decides who’s going to be attacked and when and where and why,” Crenshaw said. “Then they recruit somebody to carry it out. So the person carrying the bomb really is just a foot soldier.”

Afghanistan’s most famous suicide attack happened in 2001, just two days before the 9/11 assault on the United States. Al-Qaida operatives masquerading as journalists preemptively blew up tribal warlord Ahmad Shah Massoud in anticipation that he might aid U.S. troops if they eventually invaded Afghanistan in search of Osama bin Laden.

Today, al-Qaida, the Taliban and Hizb-i-Islami (the group led by Gulbuddin Hekmatyar) aim their suicide attacks at U.S. and Afghan government forces, but the victims are overwhelmingly civilian bystanders, often large numbers of children. Many of the bombers, Crenshaw said, are recruited from religious schools across the border in Pakistan.

The predominant motivation for terrorists to employ suicide attacks is strategic, not religious, according to Crenshaw. One suicide bomber kills many people, a perfect example of what the U.S. military calls asymmetric warfare. According to the United Nations, since the 1980s suicide bombers have been involved in only 4 percent of the world’s terror attacks, but have caused 29 percent of the deaths.

Crenshaw gave her CISAC talk the day of the bloody suicide-bomber attack on Pakistani opposition leader Benazir Bhutto. With some 140 deaths and 500 injuries, it was the deadliest of more than 50 suicide attacks in Pakistan in recent years. Bhutto survived without injury, but if she had died, the volatile country could have come unglued, according to Crenshaw. “It shows you how one major suicide bombing could make a big difference,” she said.

Her interest in terrorism began in graduate school in the late 1960s. Her first book, Revolutionary Terrorism (Hoover Institution Press, 1978), was on guerilla warfare against the French during the Algerian war for independence from 1954 to 1962. It still sells on Amazon, for $100.

How does one research suicide bombers, since most of them, by definition, are dead? “We don’t have very many studies that are based on extensive interviews,” Crenshaw said. The one well-known body of work based on interviews involves failed Palestinian suicide bombers held in Israeli prisons. But the prisoners have told their stories so often that it is difficult to separate truth from imagination, according to Crenshaw.

Scholars of terrorism in general can turn to trial transcripts, databases of newspaper stories or the “Harmony Project” documents captured from al-Qaida and posted online by the U.S. Military Academy at West Point.

But less has been written specifically about suicide bombers. “In Iraq, it’s very difficult to know who they were, even. They’re dead and they’re blown to bits, too,” Crenshaw said. “You might not have a hand with fingerprints, for example. Surprisingly enough, often they do seem to find heads. But still, how do you identify someone in Iraq, where you don’t have a record of who the population is to begin with? There are no identity cards, no nothing. Really, we’re just guessing.”

The predominant motivation for terrorists to employ suicide attacks is strategic, not religious, according to Martha Crenshaw.

Crenshaw’s most recent paper, “Explaining Suicide Terrorism: A Review Essay” (Security Studies, Vol. 16, No. 1, January 2007), relied on the bookstore: She bought and read 13 books about suicide bombers, then produced a review of them all as a guide to other researchers.

CRENSHAW'S RESEARCH AGENDA
Why is the United States the target of terrorism? Crenshaw is answering this question, as a lead investigator with the National Consortium for the Study of Terrorism and Responses to Terrorism at the University of Maryland, a Department of Homeland Security Center of Excellence. Her research focuses on groups that have targeted the United States or its interests since the mid-1960s, placing incidents in context by comparing them with instances in which groups displayed similar anti-American ideas but did not resort to terrorism.
"Contrary to popular belief, only about 10 percent of active terrorist groups have targeted the United States," she says. "You have to get into the local politics to see what's going on" with anti-U.S. terrorism abroad. Such attacks can be aimed at the local regime, she explained.
Crenshaw is also editing a book tentatively titled The Consequences of Counterterrorist Policies in Democracies, to be published by the Russell Sage Foundation which supported the research.
And "The Debate over ‘New' versus ‘Old' Terrorism," a paper Crenshaw presented at the 2007 American Political Science Association meeting, is set to appear in an edited volume. Crenshaw questions common claims that terrorism in recent years has taken on a completely new character, more religious and lethal.
"Terrorism has changed over time, but there is no fundamental difference between ‘old' and ‘new' terrorism," she said. Researchers and policymakers should "ask why some groups cause large numbers of civilian casualties and others do not," she said, "rather than assuming that religious beliefs are the explanation for lethality."