In many Construction Project CPM Schedule specifications, the maximum Original Duration for “on-site activities” is limited to a certain value. A typical threshold limit is twenty (20) work-days.
When lags are used in a CPM network, the duration value used should be checked just like any activity. Since lags can be negative, then the absolute value of lags should be evaluated against the threshold limit for activities in the CPM network.
In Zümmer, the High Duration Threshold value set in the Criticality Duration Assignment window is used to determine if a lag falls in the “Long Lag” category. In the illustration above, the Duration Threshold High value is set to 20. The report identifies 5 relationships that exceed the threshold limit. Note for line item #5 below, the lag value is negative. In addition, the report defines the threshold criteria at the bottom of the page.
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