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Difficulty measuring the effects of disaster preparedness has prevented a proper accounting of its benefits, says a paper published by the Institute of Medicine. "In principle, we could evaluate the effectiveness of an investment in preparedness with appropriate measures of outcomes such as response times, property saved, etc.," the paper (.pdf) says. But because emergencies are relatively rare and so different from each other, researchers rely on case studies or other qualitative methods, instead of empirical studies. The authors of the paper, dated Jan. 7, are two emergency medicine professors--Jesse Pines of George Washington University and Seth Seabury of the University of Southern California--and William Pilkington, the public health director for Cabarrus County, N.C.