The Vulnerability Index Survey was developed by the 100,000 Homes Campaign (www.100Khomes.org) to identify persons at greatest risk of dying on the street. It has been used by hundreds of communities across the US and has played a key role in housing almost 90,000 through the Campaign, but also in establishing a nationwide priority to house chronically homeless and medically vulnerable people. The original Vulnerability Index Survey was based on the following research:
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In the last year, the 100,000 Homes Campaign teamed up with OrgCode Consulting to update the Vulnerability Index Survey with critical daily functioning questions that yield scoring not only on health vulnerability but appropriate housing placement. After some consideration, this is the tool we are using in the Sonoma County Vulnerability Survey. You may view the resulting VI-SPDAT tool here. Scoring is incorporated in this version of the tool:
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For Sonoma County's survey, we will be using a version of the VI-SPDAT with a few additional local questions on the last page.These cannot be added to the scoring (that would invalidate the tool), but we can report on responses to the local questions as needed.

For the VI-SPDAT evidence base, click here.