Eligibility for ORP is determined by the job performed. Your institution Benefits Office will notify you if you are in an ORP-eligible position. To be eligible to participate in ORP, an employee must: (1) initially be appointed on a full-time basis for 4 ½ months or more; and (2) be appointed to a position otherwise eligible to participate in ORP. Employees who are eligible to participate in a retirement program who are not eligible to participate in ORP must participate in TRS. Examples of eligible positions include faculty positions, specialized professional positions such as physicians, engineers or attorneys, and executive-level administrative positions.