Amendment. No amendment, modification or supplement of any provision of this Agreement shall be valid or effective unless made in writing and signed by a duly authorized representative of each Party.

Amendment. No amendment to this Agreement shall be valid unless such amendment is in writing and is signed by authorized representatives of all the parties to this Agreement.

Amendments. No amendment or modification of this Agreement shall be effective or binding with respect to a party unless it is in writing and is signed by the party.

Amendment. Except as otherwise provided herein, no amendment of this Agreement shall be valid or effective, unless in writing and signed by or on behalf of the parties hereto.

Variation & Amendment. No amendment or variation of this Agreement shall be valid unless it is in writing and signed by or on behalf of each Party by its duly authorized representatives.

Amendment. No amendment or modification of this Agreement shall be effective unless it shall be in writing and signed by each of the parties hereto, and no waiver or consent hereunder shall be effective against any party unless it shall be in writing and signed by such party.

Amendments. No amendment or modification of this Agreement will be deemed effective unless made in writing and signed by the parties hereto.

Amendments. No change, amendment or modification of this Agreement shall be valid or binding upon the Parties unless such change, amendment or modification shall be in writing and duly executed by both Parties.

No amendment, modification, variation or waiver of this Agreement shall be effective unless it is in writing and signed by (or by some person duly authorized by) each of the parties hereto.

Amendment. No supplement, modification, or amendment of this Agreement shall be binding unless executed in writing by the parties with such writings specifically referencing this Agreement.