需求验证必须与终端用户协同执行，以暴露和改正不完整或不正确初始模型的所有问题。
Requirements validation must be performed in collaboration with the end users, to reveal and correct any problems with incomplete or incorrect initial models.
维度建模最重要的活动之一就是捕获聚集路径或终端用户执行上卷和下钻所依照的聚集层次结构。
One of the essential activities of dimension modeling is to capture the aggregation paths or aggregation hierarchies along which end users perform roll-up and drill-down.
您可以向执行官或者其他内部人员同时进行演示，或者每次迭代末尾时为终端用户进行演示，或者对演示进行策划用户组会议，或者以其它方式执行。
You could instead do a demonstration to executives and other insiders at the same time, or demo to end users every other iteration, or orchestrate user group meetings around demos, or whatever.
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