Modification. This Agreement may not be amended or modified except by written instrument signed by an authorized representative of the Parties.

Modification. This Agreement may not be modified unless such is in writing and signed by both Parties to this Agreement.

Modification. This Agreement shall not be changed or modified, in whole or in part, except by an instrument in writing signed by the parties hereto, or their respective successors or permitted assigns.

This Agreement may not be modified or amended except by a written document signed by the parties.

This Agreement may not be modified or amended except by an instrument in writing signed by the parties hereto.

This Agreement may not be amended, supplemented or modified except by a written agreement or instrument signed by or on behalf of the parties hereto.

Modifications. This Agreement may not be amended, canceled, revoked, or otherwise modified except by written agreement signed by both Parties.

This Contract may not be modified, amended or changed, except by written instrument signed by duly authorized representatives of both Parties.

. This Agreement may not be amended except by an instrument in writing signed by the Parties.

Amendments. This Agreement may not be modified or amended except pursuant to a written instrument executed by all of the Parties.