When faced with a lack of historical data a project manager makes various assumptions. A number of these assumptions prove incorrect triggering at least one high-impact issue.What should the project manager have used to avoid this? 当前面临缺乏历史数据时，项目经理会做出各种假设，许多这些假设被证明是不正确的，至少引发了一个高影响的问题。若要避免这个问题，项目经理应该事先使用什么？ ◑A.Explicit knowledge显性知识 ◑B.Enterprise environmental factors事业环境因素 ◑C. Expert judgment专家判断 ◑D.Organizational process assets组织过程资产
