During the execution phase of the project, you realized the subcontractors are working with incomplete and different scope statements. As the project manager, what should you do FIRST？

应该由谁负责确定项目成本偏差可接受幅度（）

由谁最终负责确定和管理项目风险 （）

下列各项哪一项不是非正式书面沟通的例子（）

Three techniques used for procurement planning are-