Hi, my last post Multiple relationships between Tasks–is this possible?, caused a lot of reactions. all of them are about using dummy Task. Here is one of them:
“Insert a dummy milestone to carry part of the logic between the two tasks. I.e. “Task1” > SS > “Start Task1” (the dummy milestone) > SS+1 > Task2. And “Task1” > FF > “Task2.”
OK! Let’s do it with Microsoft Project 2016:
First, I will create Start to Start relationship between Task 1 and Dummy Task:
Now, I will create Start to Start relationship between Task 2 and Dummy Task, with 1 day lag:
as you can see, Task 2 will start 1 day after Task 1 will start.
Finally, I will create Finish to Finish relationship between Task 2 and Task 1:
Yeah! I’ve got what I wanted! Wait! Do I?.
Let’s say that for some reason Task 1 Should start at 31.07.2017. I will put it in Start Date field, and I will create Start no Earlier than constraint:
Everything looks perfect. Task 2 is still going to start one day after Task 1 will start. Now suppose that Task 1 for some reason will have 10 days duration.
as you can see, Task 2 will finish when Task 1 is to be finished, but it will not start one day after Task 1 is supposed to start.
So, once again, you CAN NOT have more than one relationship between two Tasks!