This guide is designed to help you integrate the information in the supplemental Electronic Residency Application Service® (ERAS®) application into your residency selection process. It provides an overview of the supplemental application, outlines the timeline for accessing supplemental application information, and provides a summary of the information that will be reported to programs. The guide also provides guidance on appropriate use of supplemental application information during the selection process and highlights evaluation results from the 2023 ERAS cycle, which included 16 specialties and over 40,000 applicants. Finally, the appendix displays all supplemental application questions and instructions.