WBS items are often dependent on each other. The start date of a WBS item can depend on either the start date or the end date of another WBS item. Similarly, the end date of a WBS item can depend on either the start date or the end date of another WBS item.

At the Details > Successors or Details > Predecessors selection steps, you can select one of four dependency types for each selected WBS item:

You can also specify a time interval for a dependency. This is the number of hours/days etc. between the start/finish of the current WBS item and start/finish of the preceding or succeeding WBS item (depending on the dependency type). If there is an overlap, this number can either be positive or negative.

Start-to-finish (SF): the end of activity B is connected with the start of activity A.

Finish-to-start (FS): the end of activity A is connected with the start of activity B.

Start-to-start (SS): the start of activity A is connected to the start of activity B.

Finish-to-finish (FF): the end of activity A is connected to the end of activity B.