9.1 Where the Medium Value Change is implemented at the Facilities before the Actual Completion Date [relevant Phase Actual Completion Date], the procedure set out at Clause 17 (Pre-Completion Commissioning and Completion) shall apply to the Medium Value Change at the same time as it applies to the original Works.
9.2 Where the Medium Value Change is implemented at the Facilities after the Actual Completion Date [Phase Actual Completion Date], and constitutes additional works, the procedure set out and agreed in the Estimate for certifying the completion of the Medium Value Change shall apply to determine whether the Medium Value Change has been completed appropriately.