Mapping time-based dependency relationships

Time-based dependencies describe how the start or finish of one task is linked to another. Here they are:

• Finish-to-start is the most common dependency type, where one activity must be completed before the next begins, such as finalizing UI designs before development starts.
• Start-to-start means tasks begin together, like running security tests at the same time as setting up monitoring systems.
• Finish-to-finish requires tasks to end together, for example completing both content writing and translation at the same time for a product launch.
• Start-to-finish is the least common dependency type, where one task cannot end until another has begun, like ensuring a new support shift has started before the previous one closes.

Visualizing these relationships helps teams anticipate where delays are most likely to spread. Tools such as dependency charts or workflow boards make these links visible, reducing the chance of overlooking them. Clear mapping also supports coordination, as it shows who depends on whom and when. By analyzing the timing between tasks, product managers can identify where flexibility exists and where precise sequencing is critical.