Because the hammock task relies on other tasks for start/finish information, anything that affects those other tasks (resource leveling, constraints) will ultimately affect the hammock tasks dates.
You can either control Work or Resource Units as Hammock Task’s duration gets derived from linked tasks.
If you want to Conrol Work hrs – make task as “Fixed Work” in this case with increase and decrease in the Duration, Unit % will get changed. If you want to Control Unit % – make task as “Fixed Unit” this will increase or decrease Work in proportion to the Duration
Say you have Hammock Task with : Duration – 2d Unit – 1 Resource [100%] Work – 16 hrs.
Now due to changed in linked task Hammock Task change its duration to 4 Days.
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Fixed Work Scenario :
Duration : 4
Work Remain same [as initially calculated by VB Macro’s Duration & Resourcing] : 16 hrs
Units : R1 [25%]
Implying that now resource will work 4 hrs/day to Complete 16 hrs Work in 4 Days.
Fixed Unit Scenario :
Duration : 4
Fixed Unit : R1 [100%]
Work = Fixed Unit( hrs per day) X Duration = 8hrs X 4 days = 32 hrs
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NOTE : Making Hammock Tasks of “Fixed Duration” works fine in duration bracket which suffice its Start & Finish tasks Dates, beyond that if manually Duation for Hammock task is increased though it maintains its Finish linked Task Date but start ignoring Start Date that is drived by other task. In that case Hammock task automatically schedule itself to Start Prior to Finish Date of task from which it was drieving its Start Date intitally.
Hope this helps 🙂
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