The key document generated by the Create WBS process is the actual WBS. Each WBS component, including work package and control accounts within a WBS, is generally assigned a unique identifier from a code of accounts. "These identifiers provide a structure for hierarchical summation of costs, schedule, and resource information. "

最后这句话，是想说明什么呢，是说wbs分解完后可以产生进度计划？

创建工作分解结构的过程可以产生什么?
A 项目进度计划
B 小组外购
C 项目完工日期
D 风险清单

...这样的话每个component相关的cost，schedule，resource可以roll up到它的上一级，并依次类推，统计需要的信息