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College of Arts & Sciences
Hazards & Vulnerability Research Institute


Changes and Improvements in the SoVI® Formulation for 2005-09

SOVI® 2009 marks a change in the formulation of the SoVI® metric from earlier versions. New directions in the theory and practice of vulnerability science emphasize the constraints of family structure, language barriers, vehicle availability, medical disabilities, and healthcare access in the preparation for and response to disasters, thus necessitating the inclusion of such factors in SoVI®. Extensive prior testing of SoVI®, along with the introduction of the U.S. Census Bureau’s five-year American Community Survey estimates, permits changes to the SoVI® recipe, resulting in an overall more robust metric.

The tables below detail modifications in the base variables used to compute SOVI®. The first of these tables describes the original 32-variable set used in 2000. The second table lists changes to variables when compiling SOVI® 2009. The final table gives a complete list of 31 variables in SOVI® 2009.

As vulnerability science evolves, no doubt SoVI® will as well. Future directions for SoVI® include the consideration of pets, homeless populations, physical mobility constraints, prescription drug dependence, and social capital all at finer spatial scales.

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