A contract may also be modified for reasons other than the wishes of the interested parties. For example, a contract amendment may be necessary on the basis of a legal requirement. Or a judge may, in certain circumstances, order that a contract be amended. However, contracts are formal agreements, so there are a lot of negotiations built into them, especially business-related contracts. In these cases, it is best to ask a lawyer to check the agreement before signing it. A treaty change is a mutually agreed change to the original treaty. Their amendments must fall within the scope of the amending clause and without prejudice to the original object and effect of the Treaty. When negotiating a contract, you can modify the agreement if necessary, as long as all parties agree.