Calculating Critical Path - Can't figure out LF

whazzzzzupp17

New Member
Joined
Jul 23, 2018
Messages
21
Hello, I'm having some major problems trying to calculate this and been working on determine LF all day.

I tried Index match to lookup all the predecessors, but I think I need to us MINIF(), but it keeps outputting 0


ESEFLSLFPredecessorDuration
2/1/212/1/21=LF - Dur
2/2/212/2/21=LF - Dur1
2/3/212/8/21=LF - Dur2
2/2/212/4/21
=LF - Dur
1
4
 

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Calculating LF is not simple because you have to work forwards through dependencies and calculate slack, and determine what is the critical path. In this example, the critical path is 1 -> 2 -> 3. Task 4 is not on the critical path because it has 4 days of slack. To calculate slack you have to work through all the possible forward dependencies on all tasks. I have done this in an Excel VBA version of Microsoft Project, and I just don't think a general solution can be done simply with formulas.
 
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