37. The three major causes of change on a project are— 引起项目发生变更的三个主要原因是[ ] a. Replacement of the project manager or key project team members, changes in priorities by senior management, and contractual difficulties 项目经理或项目团队中关键人物的更替，高级管理层改变工作优先顺序，合同难以完成 b. Changes in the relative importance or time, resources, or cost, new knowledge about the deliverable, and technological uncertainty 时间、资源和成本上的相对重要性发生的变化，对可交付成果的新认识，技术的不确定性 c. Errors in the initial assessment of how to achieve the goal of the project, new information about the project deliverable, and a new mandate 对项目目标完成方式的最初评估发生错误，对项目可交付成果的新认识、新指令 d. Unavailability of resources promised by the functional managers, cost overruns, and changes in customer requirements 职能经理许诺的资源未到位，成本超支，客户需求发生变化
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