Task dependencies with all four link types and lag
Real projects overlap. Link tasks the way the work actually flows, with a lead or lag where it helps.
Finish to start (FS)
B cannot start until A has finished. The default and by far the most common.
Start to start (SS)
B can start once A has started. Good for work that runs in parallel with a head start.
Finish to finish (FF)
B cannot finish until A has finished. Useful for tasks that wrap up together.
Start to finish (SF)
B cannot finish until A has started. Rare, used for hand-over style work.
How to enter them
In the predecessors cell, type the task number. Add the type and lag after it: 3 is finish-to-start, 3SS is start-to-start, 3FS+2 starts two working days after task 3 finishes, and 3SS-1 starts one day before task 3 starts.
Checks that save you from surprises
- Conflict warnings when a task's start is earlier than its links allow.
- Dependents list shows everything that will move if you change a task.
- Arrows follow the type so the chart reads correctly at a glance.
- Import and export keep the types. Microsoft Project XML links and lag are read and written. See import and export.
Background: the four dependency types explained.
Frequently asked questions
What is lag?
A delay between linked tasks, counted in working days. A negative value, called lead, lets the second task start before the first one is done.
Can I mix link types on one task?
Yes. A task can have several predecessors, each with its own type and lag.
Related
Dependency types
A dependency says how one task's timing relates to another's. There are four types, and lag or lead fine-tunes them.
Read more →Critical path
The critical path is the chain of tasks that decides when the project ends. GenuinePlan calculates it for you and highlights it on the chart.
Read more →Gantt chart maker
Type your tasks into a work breakdown structure. The Gantt chart next to it redraws on every change, on working days, with sprint bands and the critical path highlighted.
Read more →Plan your first project in a few minutes.
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