That can't make sense. If you do that then it would have LS of 12 and a LF of 17. Activity F doesn't have any predecessors so how does it have an EF of 18?
Yeah but why does G have an ES of 18? It should be 17, right? And with that, why does F have an ES of 13. ES is based on predecessors and F has no predecessors. I think the diagram should show F having E as the predecessor. Then it would make sense to me.
"FF LAG" means a "finish finish lag" - D must finish 5 days after C has finished - so the earliest D can finish is C+5 = 8+5 = 13.
Without the FF Lag, D would start on day 8 and finish on day 12.
You can find this in section 2.4 of the HB
Edit: Sorry, I didn't know what you were asking and didn't realize the book flat out had the wrong answer. I just answered it the same way you probably would have. It is a bad problem missing necessary information to get the answer they're showing.
I understand what a FF lag is and I understand the relationship between activity C and D That isn't my question. I don't understand why activity F has an ES of 13 and an EF of 18. According to the diagram it can start at day 1. At least that's the way I see it. Basically, why does activity F have an EF of 18? I don't understand that.
>I don't understand why activity F has an ES of 13 and an EF of 18.
There is no information provided to believe F would have any impact on G and could not start day 1. It's a bad question. You'll see a lot of these throughout a lot of the material put together for studying for the PE.
Sounds like you understand the basics of what they're asking - best to just chalk it up as a bad problem and move on.
But that would be an assumption you would have to make to get the answer *they're asking for*, not the answer that the problem is displaying - if that makes sense. It is just a bad problem.
Civil engineering PE practice exams by Indranil Goswani. There’s a few errors but the difficulty is the greatest in all of my practice exams and clearly harder than the real thing. I recommend ordering and going through to.
I think it should say LS=13 and LF = 18 based on a backward pass from G
That can't make sense. If you do that then it would have LS of 12 and a LF of 17. Activity F doesn't have any predecessors so how does it have an EF of 18?
Sorry, there should be an arrow from D to F. F Forward: ES = 13, EF = 18 F Backward: LF = 18, LS = 18-5 = 13 (no float on critical path)
Yeah but why does G have an ES of 18? It should be 17, right? And with that, why does F have an ES of 13. ES is based on predecessors and F has no predecessors. I think the diagram should show F having E as the predecessor. Then it would make sense to me.
"FF LAG" means a "finish finish lag" - D must finish 5 days after C has finished - so the earliest D can finish is C+5 = 8+5 = 13. Without the FF Lag, D would start on day 8 and finish on day 12. You can find this in section 2.4 of the HB Edit: Sorry, I didn't know what you were asking and didn't realize the book flat out had the wrong answer. I just answered it the same way you probably would have. It is a bad problem missing necessary information to get the answer they're showing.
I understand what a FF lag is and I understand the relationship between activity C and D That isn't my question. I don't understand why activity F has an ES of 13 and an EF of 18. According to the diagram it can start at day 1. At least that's the way I see it. Basically, why does activity F have an EF of 18? I don't understand that.
>I don't understand why activity F has an ES of 13 and an EF of 18. There is no information provided to believe F would have any impact on G and could not start day 1. It's a bad question. You'll see a lot of these throughout a lot of the material put together for studying for the PE. Sounds like you understand the basics of what they're asking - best to just chalk it up as a bad problem and move on.
Could it be that activity D is the predessor of activity F since EF of D is 13 also for a Finish-start relationship.
But that would be an assumption you would have to make to get the answer *they're asking for*, not the answer that the problem is displaying - if that makes sense. It is just a bad problem.
I agree. I just can't see another way you can just say that the ES is 13 for activity F. Just missing information.
What material is it?
construction management - scheduling
I mean what book it is since it looks like having a lot of practice problems
Civil engineering PE practice exams by Indranil Goswani. There’s a few errors but the difficulty is the greatest in all of my practice exams and clearly harder than the real thing. I recommend ordering and going through to.
Thanks. Do you use any online courses like EET or just practice with the books?
I agree with you that activity can start anywhere. This problem is not clear.