Construction Project Management
Planning & Scheduling
Bar Charts
Building a CPM Schedule
Networks & Logic
CPM Scheduling
Logic Relationships & Precedence Networks
Progress Updating

What Drives Driving Relationships

The concept of a driving relationship explains how impacted activities will shift downstream activities. This is much more clear with a detailed explanation and some great pictures.

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All right, we're going to talk now about driving relationships in critical path method.

What's a driving relationship?

It's a relationship from a predecessor activity that controls the start or finish of the successor activity.

For the activity with predecessors, there must be at least one driving relationships. Removing that, removing non-driving relationships is not a good idea, because things can change. And if things changed, the driving relationship can change as well. And in most cases, there is only one driving relationship, but in some rare cases, there could be more than one. This may change which one is driving if any of these things change, the duration of the activity itself, the logic, the constraints, the resource leveling.

And here's an example. We wanna see for driving relationship, all right. When you see a single relationship, single predecessor, it must be driving. It's the only one and since there is at least one driving so that must be it. But when there is multiple relationships, there are multiple relationships then one of them has to be driving.

For example, which is the driving relationship to E? Is it from A or from B? It's from B because the number seven the date seven came from the early finish of B plus the lag.

What is the driving relationship to F? Is it from A, B or C? Well, it is fro...

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