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Homemade bombs or improvised explosive devices (IEDs) are staple weapons of conflicts in South Asia and especially Southern Afghanistan and Western Pakistan, where the Taliban, their affiliates, and other armed groups use them to undermine recognized governments and policies. This study establishes IED trends in the Afghanistan provinces of Helmand, Kandahar, and Nimroz and the Pakistani province of Balochistan between 2002 and mid-2009, using geo-referenced open source IED event information and statistical or geospatial analysis techniques. This study also furnishes assessments of specific IED technologies, techniques, and procedures (TTPs; like explosively formed projectiles or radio-controlled “spider devices”) as well as discussions of their potential causes and observable effects. There are several major trends observed: a continuous increase in volume and lethality of attacks, more expansive geographic distribution of attacks, and multiple bombing campaigns overlapping in Quetta, Balochistan province, that are perpetrated by groups with different means, tactics, and objectives. The most IED-related violence occurred in Kandahar province from 2002–2008; however, Helmand province was the leading location of bomb events by early 2009. Although large population centers—such as the cities of Kandahar, Quetta, and Lashkar Gah in Helmand province—commonly experienced effective bombings, the trans-border routes through Zaranj in Nimroz province and Spin Boldak in Kandahar province were also prone to many lethal attacks. In particular, this study both confirms and scrutinizes the so-called Iraq effect, the phenomenon of knowledge-sharing between fighters in Iraq and Afghanistan. Even though fighters who gained experience in the Iraq insurgency provided assistance and training to Taliban fighters, the evidence indicates that some developments in IEDs predated the Iraq conflict or were original to South Asia or other conflicts in history. This evidence provides support for a more generalized and global phenomenon here called “TTP acceleration,” whereby insurgent and terrorist advances in IED capabilities take progressively shorter periods of time to develop and transfer among groups, usually as a result of increased information-sharing opportunities and coincidental alignment of group objectives.  相似文献   
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