This guide provides an explanation for the questions Social Security asks in the application for Social Security Disability Insurance (“SSDI”) benefits and Supplemental Security Income (“SSI”). These questions are derived from the most updated paper application (as of December of 2017). An application for Social Security Disability can be completed, on-line, in person, by phone, and by mail. This guide was created for informational purposes only and not for the purpose of providing legal advice.