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| Hammocks
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A hammock groups activities, milestones, or other hammocks together for reporting. A hammock's milestone number ranges from 95 to 99. This allows for five levels of summation. For example, two hammocks at the 95 level can be combined in a 96 level hammock. Any number of hammocks are allowed within the five levels for a project. Most PM software calculates the duration of a hammock from the early and late dates of the activities to which it is linked.
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| Histogram
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A histogram is a graphic display of resource usage over a period of time. It allows the detection of overused or underused resources. The resource usage is displayed in colored vertical bars. The ideal level for a resource on the screen is indicated by a another color (typically red). The vertical height is produced by the value specified in the maximum usage field of the Resource Label window. (The printed histogram uses a horizontal line to display the maximum usage set in the Resource Label window.) If the resource bar extends beyond the red area for any given day, resources need to be leveled (or spread out) for proper allocation. The resource histograms should be checked after resources are assigned to the project activities.
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