What is the best way to create a Gantt that schedules backwards automatically from a due date?
We have a planned date that we need to be on a construction site to start our work. From that "due date" i know it takes 2 weeks to gather and fabricate material, so i would like the start date of that task to be 2 weeks prior to the due date. Then i would create another task with an automatic due date before the first task's start date, with a 10 day duration. Essentially i am building a schedule with multiple tasks, backwards, to create a schedule. Is this possible?
I realize it would not automate the additional tasks and those would need to be added manually, but i am not sure how set them to use dependencies/predecessors/durations properly to make this work.
In this example the dates would be built by entering 12/15/23 into the due date of the first task
Task Name -- Start Date -- Due Date
1) Fabrication/delivery -- 12/1/23 -- 12/15/23
2) Stocklist -- 11/20/23 -- 11/30/23
Answers
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You would use Start to Finish predecessors.
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I use negative predecessors, just like you would do in MSProject, based on row number. In this sheet, I do forward scheduling at the beginning of the tasks, as they have to start at a specific date. But then work backward from the Live date.
This works great and you can quickly see how your dates line up.
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