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== Basic methodology ==
[[File:Social Vulnerability Index variables grouped into four themes.png|thumb|CDC/ATSDR Social Vulnerability Index variables grouped into four themes]]
The basic methodology of constructing a vulnerability index is described by [[University of Malta]] researcher [[Lino Briguglio]] who developed an economic vulnerability index (EVI) for describing the economic vulnerability of [[Small Island Developing States]] (SIDS).<ref name="Pereira">{{cite journal |last1=Pereira |first1=Edwina E. |last2=Steenge |first2=Albert E. |title=Vulnerability and Resilience in the Caribbean Island States; the Role of Connectivity |journal=Networks and Spatial Economics |date=1 September 2022 |volume=22 |issue=3 |pages=515–540 |doi=10.1007/s11067-021-09533-w |language=en |issn=1572-9427|doi-access=free |pmc=8159251 }}</ref><ref>{{cite journal |last=Briguglio |first=Lino |date=1992 |title=Preliminary Study on the Construction of an Index for Ranking Countries According to their Economic Vulnerability |journal=UNCTAD/LDC/Misc.4
}}</ref> The individual measures are weighted according to their relative importance. A cumulative score is then generated, typically by adding the weighted values. [[Decision tree]]s can evaluate alternative policy options. Much of the original research has been evaluated by Lino Briguglio and presenters at Oxford, providing a body of secondary source material.
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