How to use Dependencies on Gantt Chart?
Dependencies show the relationship between cards on board. They indicate when a card should begin or end in relation to other cards.
To add predecessor, Open Card Details, go to Dependencies section, and select a card.
Some cards in the drop-down list are greyed out. If it happens, that card cannot be chosen, as it would create a circular dependency, i.e. cards would either directly or indirectly depend on each other.
To remove predecessor hover your mouse over it and click Remove.
Cards are linked through a simple Finish-To-Start Dependency, which means that the first card must be finished before the second card can start.
If this logic is violated, a blue arrow connecting the bars turns red, prompting you to adjust the dates.
Dependencies make connections between tasks more visual and your projects – more manageable.