Developed through a strategic partnership between the U.S. Department of Labor (USDOL) and state unemployment insurance (UI) agencies, the State Information Data Exchange System (SIDES) and SIDES E-Response offer employers and third-party administrators (TPAs) –free of charge – a secure, electronic and nationally-standardized format to better anticipate and supply the data needed for responding to UI information requests, reduce follow-up phone calls and streamline UI response processes.