Critical path by Total Float is wrong in multiple calendar project

In Primavera we can define Critial activities by 2 option:

5

There are many reasons why we should choose Longest Path instead of Total Float. One of the reason is that when our project has multiple calendar.

We have 4 activities which have same calendar : Standard 5 day workweek. We use Total Float to calculate Critical path. The result is this:

1

When I change A1020 activity’s calendar to 1 Day Workweek. We use Total Float to calculate Critical path. The result is this:

2

You can see it’s wrong critical path.

Now when you choose Longest path option. It will become like this:

3

4

Now the critical path is better 🙂

So when you have multiple calendar project, consider to use Longest path option.

 

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Author: Khuong Do

Khuong Do is a Project Planner in Civil, Transportation and Oil & Gas Industry. He has worked as a Primavera Consultant Specialist since 2006 . He holds a Civil Engineering degree and a Bachelor of Information Management System. Now he is working in Petronas RAPID project, one of the biggest Refinery and Petrochemical complex, in Pengerang – Malaysia.

3 thoughts on “Critical path by Total Float is wrong in multiple calendar project”

  1. This is what I like to call “An Undocumented Feature”. translation; a Primavera Gotchya that will sneak up and getchya when you least expect it. This explains why I have seen some really odd critical paths on my project.

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