description:   WBS(Work Breakdown Structure) is one of the methods often used in project management practices. It shows the list of smallest units of tasks(called work packages) in the manner of structure, for mangements to grasp the complex schedule easily. Each unit has the information like "planned" start date, end date, cost and resouces and "actual" those. As time goes by, it shows the variance of "planned" and "actual" and enable management to take necessary actions to eliminate the variance.
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