In Primavera P6, once all the activities are clearly defined and the corresponding durations accurately estimated, the next step in the scheduling process is to define the relationships between these activities. This can be a deceptively challenging process. It may appear that you have all the relationships between activities sufficiently defined. But when you start the update process your schedule has logic and critical path errors that are difficult to spot. These errors are most likely caused by an open network somewhere in your schedule. This means that the relationships between activities have loose ends. Show
A common relationship susceptible to loose ends is the Start-to-Start relationship, where the start relationship of the activities is clearly defined, but the finish relationship of the activities has no definition. This is an open network problem, and, in particular, the Start-to-Start open network problem. This article discusses the problem of the Start-to-Start (lag) open network, and how to solve this open logic issue using Primavera P6. Benefits and Pitfalls of Start-to-Start RelationshipsThe most common relationship between activities in scheduling software is the simple Finish-to-Start relationship. For the tasks Dig Trench and Lay Pipe a Finish-to-Start relationship on the Gantt chart would look similar to Figure 1.
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