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There could be a lag or FF relationship or both that actually do drive the finish of a concurrent in-progress successor relationship.Īn in-progress activity could have a SS or FF relationship with a not-started successor activity making the use of dates to accurately “figure out” which activity drives the Critical Path on a pdf even less likely. The truth is, we really can’t determine which activities are actually driving the Critical Path with a pdf. Slippage for this work could drive the start of M-1040 and the finish of M-1010.Ĭould you have determined this without the Successor information shown at the bottom of the Fig 8? But How Do We Determine This With a pdf? Figure 9 – multiple in-progress activities shown on Critical Path Activity M1000 is the activity to focus on managing or pushing to maintain or improve the scheduled finish date. (The finish of the activity with the SS relationship is not driving any critical work as both activities have started). However, the critical successor relationships are the Finish-to-Start (FS) relationship and 2-day lag with activity M-1040, the SS relationship and 2-day lag with activity M-1020, and the Finish-to-Finish (FF) relationship with activity M-1010. Figure 8 – activity M1000 successor relationshipsĪctivity M1000 has five successor activities. The finish of activity M-1020 is not driving the Critical Path. Figure 7 – activity M-1020 successor relationshipsĪctivity M-1020 also has a SS relationship and 2 days lag, with the successor activity M-1030, shown as critical. Both have started as sequenced, so the finish of activity M-1010 is not driving the Critical Path. This activity has a SS relationship with successor activity M-1030, shown as being on the Critical. But is this activity driving the Critical Path? No, it is not. We can see that activity M-1010 shows as in-progress on the Critical Path. Figure 6 – activity M-1010 successor relationships (Many owners and owner rep’s do not have the ability to view the project in native format). How do we know which in-progress activity to focus on? If you only have a pdf to review, how do you know. Figure 5 – multiple in-progress activities shown on Critical Path (The finish of these activities does not drive the start or finish of any critical activities). I find that more often there are Start-to-Start (SS) relationships that allow in-progress activities, which do not drive any critical work, to show as critical. Figure 4 – multiple predecessor activities driving the Critical Path For the contractor who has the ability to view the schedule in native format, it is easy to see which activity(s) are driving the Critical Path. Sometimes, there actually can be two activities which both drive the Critical Path. Figure 3 – Longest Path with a single driving activity Critical Path Driven by a Multiple Activitiesīut what about the Critical Path with more than one in-progress activity showing? Are they all driving? Usually, there is one in-progress or un-started activity driving the Critical Path, so it’s not difficult to know which activities to focus our effort on to maintain or improve the scheduled finish date for the project. Critical Path Driven by a Single Activity This is the sequence of activities we can’t afford any slippage to. This allows the Critical Path to be shown as the longest logical path through the schedule network to completion. I prefer to use “Longest Path” to define the Critical Path. Figure 2 – defining “Critical Path” in Primavera P6 With this scenario, an activity may be critical or near critical or just report negative Total Float, but that doesn’t help us for Critical Path analysis. This is especially true if the project is behind schedule. Or it just happens to have a Total Float value that makes it show as critical. If the Critical Path is defined as “Total Float <= 0 or a Total Float value”, and the project is complex enough to have more than one activity calendar, we really can’t be sure the Critical Path shown is critical to the constrained finish of the project completion or phase completion milestone. Do you ever look at a pdf of the schedule and see multiple activities in-progress that are also showing as critical? Figure 1 – multiple in-progress activities shown on Critical Pathįirst, we need to know how the Critical Path is defined in the schedule ( Primavera P6 Total Float and the Critical Path).