Derogations from the execution of these works, on the other hand, are generally carried out according to a modification procedure provided for in the terms of the contract. Typically, construction projects will be so large and time-consuming that it is administratively less burdensome for the parties to agree in advance on a change procedure, so there is no need to amend the contract every time the scope of work changes. An exception to this general rule is that a contract that is required by law must be concluded in writing or that has been proven to have been concluded in writing – for example, a consumer credit or a consumer lease – can only be amended in writing. Sometimes it is not only wise, but essential to amend a contract in writing. Commercial contracts often contain a clause that provides that an amendment is only effective if it is made in writing and signed by all parties. However, there may be limited exceptions if one of the parties invokes the other`s assurance that an oral amendment is valid regardless of the existence of such a clause. In such cases, the doctrine of forfeiture may prevent the party from applying the “amendment in writing” clause. “GDPR” means the General Data Protection Regulation (EU/2016/679); When the parties amend a contract in writing, it is usually easy for a party to assert their rights to prove the agreed change by referring to a change agreement or exchanging emails. Similarly, a party making an oral amendment should be able to determine how the amendment agreement was reached.

However, if a party claims that a contract has been altered by behavior, things can be a little more complex. For example, in a contract for the delivery of goods, the parties may agree that the delivery time of the goods should be shortened by one week in exchange for an increase in payment, while the other conditions remain the same. .