This Agreement constitutes the entire agreement between the Parties with respect to the subject matter thereof and supersedes all prior or contemporaneous negotiations, promises or agreements (including, but not limited to any proposal submitted by PCT to Client relating to Services to be provided by PCT) of every nature with respect thereto, all of which have become merged and integrated into or be deemed to be merged into the Agreement. No modification to the Agreement shall be effective unless it is in writing signed by each Party.