Hammock

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An activity that spans between two points in a network diagram. It has no duration of its own but derives one from the time difference between the two points to which it is connected. In the precedence diagram below the hammock (H) stretches from the start of activity B to the finish of activity E.

 

Precedence diagram with hammock

 

During critical path analysis its duration will be derived from the period of time between the early start of B and the early finish of E as shown in the Gantt Chart below.

 

Hammock on Gantt Chart

 

Few contemporary scheduling software packages offer hammock as a feature. Instead they allow a hierarchy of activities and summary activities. This can achieve something very similar to hammocks but is not as flexible.

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31st July 2014Link to Italian translation added

Hammock

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