The document summarizes the development and use of the Sense of Community Index (SCI), a quantitative measure of sense of community. It describes revisions made to the SCI to address reliability issues and create an improved version, the SCI-2. Testing of the SCI-2 with 1,800 people found it to be highly reliable with strong internal reliability for the overall scale and its subscales. Instructions are provided for administering and scoring the 24-item SCI-2.