And once again, I would be willing to bet money that many of the users of Microsoft Project never change the default task dependency types within their project schedules.
The 4 types of Task Dependencies in Project 2010 are:
- Finish-To-Start (FS) – the initiation of the successor task depends on the completion of its predecessor
- Finish-To-Finish (FF) – the completion of the successor task depends on the completion of its predecessor
- Start-To-Start (SS) – the initiation of the successor task depends on the initiation of its predecessor
- Start-To-Finish (SF) – the completion of the successor task depends on the initiation of its predecessor
The most common and default type of task dependency found in project schedules are the Finish-To-Start (FS) dependencies.
Leads and Lags:
In addition to selecting a type of dependencies between tasks, you also have the option of assigning leads and lags on the relationship.
- Lead – a lead allows for the acceleration of the successor task. For example, the landscaping can be scheduled to start three weeks prior to the completion of the construction of the house. This would be a Finish-To-Start task dependency with a three week lead.
- Lag – a lag is a delay in the successor activity. For example, the editing of an instruction manual could begin one week after the technical writers have begun. This would be a Start-To-Start task dependency with a one week lag.