The OSD Electronic Registrar Online (ERO) System is the tool that administrators, teachers, secretaries and instructional assistants use to register for staff development courses. The ERO provides users with staff development reports and allows session presenters to monitor session registration. All training attendance is tracked through the ERO. The ERO administrator manages the input of District-wide course offerings, creates ERO training products and processes, verifies and corrects all attendance records and supports and trains all ERO users. N.I.S.D. employees can find information about using the ERO system on the OSD Intranet page. ERO (Electronic Registrar Online).