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

CPM Example 2

Here's a 2nd CPM calculation example for you to digest. This project is bit bigger and more complex.

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All right. We're going to take a second example here because later on I wanna use this example for illustrating couple of things, including free float and constraints. As you see, this example has these activities along with their durations, IPA which is, again, immediately preceding activities.

Now, we draw the network. And luckily, this network starts with one activity and finishes with one activity, so we don't have to add those Project Start and Project Finish events. After we draw the network again, I would put it next to the table that shows the IPAs and make sure that no relationship has been violated, and no relationship is missing.

And we start now with the forward pass. As you see here, A is 0 and 5. B is 5 and 12. C is 5 and 9. And then E takes the latter of the two dates, 12 and 9, 12 the finish of B, and 9 the finish of C. So it's 12 plus 6 duration, 18. F is dependent on C, so it's 9 plus 3, 12. D is dependent on B, so it's 12 plus 5, 17. G is dependent on D and E. The latter is 18, so it's 18 plus 8. And then we go all the way to J, the last activity on the network, and it's dependent on three activities, G, H, and I. And the last one to finish is G on the 26. So J can start on 26 plus 1, 27. So the project will finish in 27 days.

Now, we take that finish date, 27, and put it back on J. And we start the backward pass, 27 minus 1, ...

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