In these counts, there is a way of writing down who is most vulnerable, who is most in danger from being homeless. This is called a vulnerability index. Workers complete the vulnerability index by asking about medical problems. Then they try to persuade those who spend the most time on the streets to seek permanent housing. They do this even if the people still have drug, alcohol or medical problems. Some of those involved in the issue of homelessness consider Common Ground a pioneer - someone who thinks up new ways to deal with old problems. 