本合同的任何补充、变更和修改应当以书面方式进行，于双方授权代表共同签字之日起生效。

Any additions, changes and modifications should be carried out in writing to this contract, authorized representatives of both parties effect the date of signature.

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工程变更也就是合同变更，是指对合同中的工作内容作出修改，或者追加或取消某一项工作。

The engineering modification is also the contract modification, which means that some modification, superaddition or canceling is done in content of contract.

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工程变更是指由于设计文件或技术规范修改而引起的合同变更，它对工程造价管理工作有较大的影响。

The change of project refers the changes of contract caused by the modification of design document or technical specifications, which has great impact on the work of project cost management.

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