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Critical vs Near Critical Delay in Construction projects

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Zaka Ullah Senior Planning Engineer| Dutco Construction Co. LLC Abu Dhabi, United Arab Emirates

A near-critical chain and the critical path can sit three days apart on the report, and almost nobody treats them the same way.

One gets tracked every single update. The other gets a passing glance, right up until the three days disappear, and it becomes the path actually controlling your finish date.

On a project I worked on, that shift happened inside six weeks, and the update explaining how it happened was already two reports behind by the time anyone noticed.

  1. The critical path is the chain with zero float, the one controlling completion today.
  2. A near-critical chain carries a small amount of float, close enough that one bad week can hand it control of the project.
  3. Float gets spent by delay events. Once it’s gone, criticality moves, sometimes from one chain to a completely different one, more than once across a project.
  4. There’s no fixed number of days that stay safe. What counts as near critical depends on how much float is left against how fast it’s being used up.
  5. Track only the zero float path each update, and you’ll catch a shift in criticality the month after it happened, not the month it actually happened.

Float, in one line: the spare time an activity can absorb before it starts pushing the finish date. Near critical means that spare time is almost gone.

The path that matters next month is rarely the one making headlines this month. It’s the one quietly running out of room right now.
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Aung Sint
Community Champion
Lead Consultant| Laminar Projects

This reinforces a point I've seen play out in practice. Tracking only the zero-float path gives you a view of where the project is today, not where it is heading.

What I do is run a multiple float path analysis on the schedule and look at the most critical paths, usually the top 10 from P6, rather than just the single critical path. That flags both critical and near-critical activities, and it gives us something concrete to prepare mitigation actions against before float runs out.

I also make it explicit to the project managers which path is driving the completion date now, and which path would take over if delays hit the near-critical chain. It turns a float number into a decision they can act on.

On my last project, the critical path kept switching between two parallel work activities. If we had only been watching whichever one was critical at the time, we would have been reacting after the shift rather than ahead of it.

That is why I agree with Zaka that the path to watch is rarely the one making headlines this month.
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Abolfazl Yousefi Darestani Manager, Quality and Continuous Improvement| Hörmann-TNR Industrial Doors Newmarket, Ontario, Canada
I personally monitor all tasks, with particular attention to those that are behind schedule. Of course, the priority is given to tasks on the critical path or those with limited float. However, based on my experience, it is important to keep an eye on all tasks, as even those with sufficient float can eventually become critical.
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Lissette Indhira Pimentel Sosa
Community Champion
Program Manager| HARPER SRL Santo Domingo / Distrito Nacional, Dominican Republic
Thanks for sharing this example, Zaka. It's a useful reminder that monitoring the current critical path alone may not be enough, especially when other activities are gradually losing their available float.

Is there a particular aspect of monitoring near-critical paths or anticipating schedule impacts that you'd like to explore with the community? Your experience could lead to an interesting discussion about how other project professionals identify these shifts before they affect delivery.
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Victor Appiah-Nkwantabisa Project Manager | Linbisa Prime LLC Glen Burnie, MD, United States
That's a great point! I agree that near-critical activities deserve as much attention as critical-path activities. A few days of buffer time can vanish quickly because of unexpected delays, resource shortages, or poor coordination. Effective project management isn't just about monitoring what is critical today; it's also about identifying what could become critical tomorrow. Proactive monitoring and early intervention are essential to prevent costly delays.

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