o Either party may serve a Change Notice proposing a Change and such Change Notice shall be processed in accordance with the following sections of this Change Protocol:
■ an Authority Change to the Services or the Original Facilities which is a Low Value Change shall be processed in accordance with Part 2 of this Change Protocol;
■ an Authority Change to the Services or the Original Facilities which is a Medium Value Change shall be processed in accordance with Part 3 of this Change Protocol;
■ an Authority Change to the Services or the Original Facilities which is a High Value Change shall be processed in accordance with Part 4 of this Change Protocol; and
■ a Contractor Change to the Services or the Original Facilities shall be processed in accordance with Part 5 of this Change Protocol.