In this way, all interested parties are better protected against accidental treaty change, without explicit agreement and, above all, without written proof of their explicit consent. You will often find this clause towards the end of the contractual document. Our models contain it of course. Consideration could take many forms, for example: mutual abandonment of existing rights; the new benefits granted by each Party to the other Party; the assumption and/or release of commitments. In the absence of consideration, a modification may be made by act. The Common Law allows a written contract to be amended subsequently by mutual agreement between the parties, orally or in writing. However, it is customary to include in commercial contracts an amendment clause which provides that all amendments to a contract are ineffective, unless they are made in writing and signed by or on behalf of both parties. This clause is intended to prevent informal or accidental oral anomalies. .