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

Logic Linking Example With Finish-to-Finish Relationships

Another logic linking example that covers the Finish-to-Finish relationship type.

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All right. So, we're now going to cover now the finish to finish relationships and we have a project of three activities, A, B, and C. And they are connected with finish to finish relationships meaning that B cannot finish until A is finished. C cannot finish until B is finished. And there is no restrictions as far as the start of the activity. No start of an activity impact the other one. A is 12 days. B is... A is 10 days. B is 12 days. C is 3 days. And by the way, you can draw those relationships, whether they are start to start or finish to finish, on the top or the bottom. You can do this like this is you want or as I drew it up.

All right. So, let's start the forward pass and the backward pass. A is 0 and 10. B is 0 and 12. Why 0 and 12? Nothing restricts the starting of activity B so it's 0. And B takes 12 days so 0 plus 12, 12. After we put the 12 here we check with the relationship. Does this 12 violate the relationship? No, it doesn't because it says B has to finish on the day of finish A...of A is finished or after. So, this is after. It doesn't violate the relationship. If we put 0 and 3 for C, the 3 here would definitely violate the relationship, the finish to finish relationship with B.

This relationship says that C cannot finish any earlier than the 12th. All right. 12 minus 3 is 9. All right. So, this project can be completed in 12 days. No...

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