Engineering changes can bring some benefits to enterprises but may cause some loss at the same time. Therefore, it is a very important aspect of engineering change management to correctly measure the pros and cons of a change and make the right change decision. 工程变更在给企业带来一定效益的同时也可能会对企业造成一定的损失,如何准确衡量变更的利弊大小,做出正确的变更决策,是工程变更管理中一项重要的研究内容。