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A '''vulnerability index''' is a measure of the exposure of a population to some hazard. Typically, the index is a composite of multiple quantitative indicators that via some formula, delivers a single numerical result. Through such an index "diverse issues can be combined into a standardised framework...making comparisons possible".<ref name=app6>{{Cite web |url=http://www.geog.ox.ac.uk/news/events/ccamts/appendix06.pdf |title=The Climate Vulnerability Index:relevance to the Tourism Sector |access-date=2011-06-23 |archive-date=2012-03-16 |archive-url=https://web.archive.org/web/20120316102207/http://www.geog.ox.ac.uk/news/events/ccamts/appendix06.pdf |url-status=dead }}</ref> For instance, indicators from the [[physical sciences]] can be combined with social, medical and even psychological variables to evaluate potential complications for [[disaster planning]].
The origin of vulnerability indexes as a policy planning tool began with the [[United Nations Environmental Program]]. One of the participants in the early task forces has also conducted secondary research documenting the evolution of the analytic tool through various stages. The term and methodology then expanded<ref>{{Cite web |url=http://www.macchomeless.org/pdf/ResultsFactSheet-Omaha.pdf |title=Homelessness and the Vulnerability Index: A Guide to Registry Week Results in the Omaha Metro Region |access-date=2011-06-24 |archive-date=2012-03-26 |archive-url=https://web.archive.org/web/20120326014638/http://www.macchomeless.org/pdf/ResultsFactSheet-Omaha.pdf |url-status=dead }}</ref> through medical literature and social work as discussed by [[Dr. James O'Connell]] of [[Boston Healthcare for the Homeless]].<ref>{{cite web |url=http://www.jedc.org/forms/Vulnerability%20Index.pdf |title=Vulnerability Index: Prioritizing the Street Homeless Population by Mortality Risk |author=Juneau Economic Development Council |date=2009|publisher=Common Ground |access-date=25 May 2013}}</ref><ref name="Padgett">{{cite book |last1=Padgett |first1=Deborah |last2=Henwood |first2=Benjamin F. |last3=Tsemberis |first3=Sam J. |title=Housing First: Ending Homelessness, Transforming Systems, and Changing Lives |date=2016 |publisher=Oxford University Press |isbn=978-0-19-998980-5 |pages=115-116 |url=https://books.google.com/books?id=k4x2CgAAQBAJ&pg=PA116 |language=en}}</ref><ref name="Rothschild">{{cite book |last1=Rothschild |first1=Steve |title=The Non Nonprofit: For-Profit Thinking for Nonprofit Success |date=11 January 2012 |publisher=John Wiley & Sons |isbn=978-1-118-18022-8 |pages=33-35 |url=https://books.google.com/books?id=j9hTMV7peD0C&pg=PA33 |language=en}}</ref>
== Basic methodology ==
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