Introduction -- Operational surprise and response -- The contemporary IED experience -- Data sources -- U.S. experience in Iraq -- The U.S. response -- Recognition -- Institutional response -- Organizational -- Equipment -- Vehicles -- Electronic countermeasures -- Training and doctrine -- Research and development -- Industrial -- Funding -- Policy -- Summary assessment -- The Australian experience in Iraq -- The Australian response -- Recognition -- Institutional response -- Organizational -- Equipment -- Training and doctrine -- Research and development -- Industrial -- Funding -- Policy -- Comparative analysis of responses -- Leadership changes -- National interests and equities -- Adequacy of existing capabilities -- Countervailing assessments -- Conventional thinking -- Adequate agility -- Flexible force structure -- Other considerations -- Failure to anticipate and the risk of overreaction -- The focusing power of casualties -- Subsequent experience - Afghanistan -- Conclusions.