Oregon Revised Statutes Public Officers and Employees § 242.560

(1) The board shall prepare and keep a register for each grade or class of positions of the persons whose average standing, upon examination for such grade or class, is not less than the minimum fixed by the rules of the board, and who otherwise are eligible. Such persons shall take rank upon the register as candidates for beginning employment positions in order of their relative excellence, as determined by the examination. Candidates of equal standing shall take rank upon the register according to the order in which their applications are filed. The board may, by rule, provide for striking candidates from the register, after they have remained thereon for a specified time.

(2) The board shall prepare and keep a register for each grade or class of positions of the persons eligible for promotion. Such register shall contain information concerning merit in service, fidelity in service and seniority in service. Such persons shall take rank upon the register as candidates for promotion in order of their relative excellence, as determined by merit in service, fidelity in service and seniority in service. Candidates of equal standing shall take rank upon the register according to the order in which their applications are filed.