项目管理知识体系包含了许多内容，它是对项目管理专业知识的一个总结，正如法律、医药和会计等其它专业一样，这一知识体系也有赖于那些实践者和学者们对它加以应用和提高。-Project Management Body of Knowledge contains many elements, it is a project management expertise to a conclusion, as law, medicine and accounting, like other profession