Double condition task

[Azar (Denis Margot)]

I want to add a supervisory task (Task 3) with no specific duration other then supervizing Task 1 and Task 2. Let’s say Task1 starts on Jan 1st until jan 15th and Task 2 starts on jan 10th until feb 1st.
I create Task 3 with 2 dependancies : Task 1 as a Début-Début and Task 2 as Fin-Fin (this should force the start date and the end date of task 3).
Then Gantt diagram displays the relations but Task3 is not having the duration from jan 1st to feb 1st (should be 32 days). Start date and end date are actually both on feb 1st.

Am I misunderstanding something ?
Thanks,

[DmitryBarashev]

GanttProject does not change the durations of regular tasks, sorry.

[Azar (Denis Margot)]

Ah, ok, so there is no possibility to use “elastic task” that would adapt to unavoidable changes in the life of a project ? Like supervision or follow-up ?
Thanks

[malcaraz (Manuel)]

@Azar

use “elastic task”

Yes… Simulating with GP in “summary tasks” as shown in those posts.

GanttProject with similar MSProject timeline feature. Example attached

Hello all, I have been trying to get an example of how could I emulate the feature called “timeline” in MSProject 2013+. The idea is to get some tasks “on top” that are linked to the schedule, and are automatically updated. In MSProject you can set a value to be a reference to another cell (as Excel does); but not sure in GanttProject (i.e. make two tasks to share the same duration value in a single cell). So, I tried it with dependencies. See example attached. How do GanttProject users get…

Duration based on links

Hello! Dmitry is right, using dependencies is not possible… … but a summary task fulfills your requirement as shown in attachment. find attached screenshot. [gp forum 20221107]

[Azar (Denis Margot)]

Ok, I see. Using 2 “half-tasks” do the job.
Thanks.