PMP® Exam Tip: Leads, Lags and... Hammocks??
The terms leads and lags are used to identify and
control the timing of various activities within the
project. It is important to accurately document leads
Lead Time: Let's assume a project has two pieces that
need to be completed at the same time. Work package
A will take 4 weeks to complete, but work package B
only takes one week. B would show in the project plan
as a finish to start (FS) with a one week lead. This
means the B work package component should start one
week before A is scheduled to be completed.
Lag Time : Lag time can best be described as a planned
or forced delay. A great example of this is a
construction project that involves pouring concrete.
The project plan must include a lag time of 2 days for
the concrete to dry before the next phase can begin.
Hammock Activity: Hammock activity is also frequently referred to as summary activity. These
are activities that are roughly related and are reported as a single activity. Sometimes the
relationship between the activities is clear, other times they may only be related because their
completion leads to the same result. On a gantt chart a hammock activity is usually displayed as
a thick black bar above a grouping of lower level activities.
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