Positive variance - The amount by which actual project performance is better than planned project performance. Positive variances in time and budget show the project is proceeding faster and is less expensive than planned, respectively.
Precedence diagramming method (PDM) - The process of constructing a project schedule network diagram. It illustrates the logical relationships between project activities and shows the order in which they must be performed by using nodes to represent activities and arrows to show dependencies. PDM also indicates early and late start and finish dates, as well as activity durations.
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