I just finished the PM Precast episode "Network Diagram" E06.07. Good episode, and well explained.
However, I have one question: My understanding it that one should calculate the f-pass and b-pass on the critical path FIRST. This is especially important since the LF of the final critical path node is the late finish for any other final nodes (if any). Is this incorrect?
After I've been throuhg this topic several times, it apears to me that f-pass/b-pass are necessary, not only for calculating the Critical Path, but only necessary to calculate the Free Float and Total Float.
This is because you can calculate the Critical Path using another method which does not require f-pass/b-pass, which is simply to add-up the duration for all the possible paths and the longest one is the Critical Path.
Appreciate to tell me if my understanding is correct.
First, you can determine the number of paths simply by looking at the diagram. You can also add up the arrows. Count the number of arrows leaving the "start" box, and every time an activity node explodes into two, add another path (or if it explodes into three, then count two - and so on). Now you know how many total paths.
Next, identify the activities in each path (i.e. Path 1 = A,B,D; Path 2 = A,B,C). Now just add the durations of each activity node in each path ... and violia! You have just found the critical path! It's the path with the highest number.
And now I can get float too! Simply subtract the next highest path from the critical path. Say you get the number "2". That is now the float for every activity on that path (unless a node is already filled in from a previous path).
That's it! I have critical path AND float and never calculated using FP/BP. I also use this as a check when I do FP/BP, because the floats should obviously equal each other.
Moderators: Yolanda Mabutas, Ahmed Amin, Scott Gillard, Mary Kathrine Padua, ERIC BARTLETT, Gail Freedman, Kevin Nason, Steven Mudrinich, PMP, Mark Wuenscher, PMP, John Wolverton, Tracy Shagnea, PMP, Jada Garrett
This interview with Simona Fallavollita (LinkedIn Profile) was recorded at the magnificient Project Management Institute (PMI)® Global Conference 2017 in Chicago, Illinois. We discuss the how, what, why and when of the changes that are coming to the PMP exam.