MS Project: Linking Tasks
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How do task links affect the schedule?
Task links (dependencies) show the relationship in time of one task to another. Linking tasks creates task dependencies. The long chain of tasks determines the entire length and end of a project. You have both Predecessors and Successors, ones that a task relies on and those task that rely on the current one.
Project management tip As you link tasks in a project, a path of links is set up. This path determines the end of your project. Some paths that you create are paths and some are the critical paths. A critical path is that path that when any task is delayed this will make the total project late.
Link type Description
Finish-to-start (FS) 
The dependent task (B) cannot begin until the task that it depends on (A) is complete.
For example, if you have two tasks, “Dig foundation” and “Pour concrete,” the “Pour concrete” task cannot begin until the “Dig foundation” task is completed.
When you link tasks in Project, the default link type is finish-to-start.
This link type is the default type. If you don’t specify a link type, the Finish-to-start relationship is assumed.
Start-to-start (SS)
The dependent task (B) cannot begin until the task that it depends on (A) begins.
The dependent task can start at any time after the task that it depends on begins. The SS link type does not require that both tasks begin at the same time.
For example, if you have two tasks, “Pour concrete” and “Level concrete,” the “Level concrete” task cannot begin until the “Pour concrete” task begins.
Finish-to-finish (FF)
The dependent task (B) cannot be completed until the task that it depends on (A) is completed.
The dependent task can be completed at any time after the task that it depends on is completed. The FF link type does not require that both tasks be completed at the same time.
For example, if you have two tasks, “Add wiring” and “add plumbing,” both must be completed at the same time before any inspection can be done.
Start-to-finish (SF)
The dependent task (B) cannot be completed until the task that it depends on (A) begins.
The dependent task can be completed at any time after the task that it depends on begins. The SF link type does not require that the dependent task be completed concurrent with the beginning of the task on which it depends.
This link type is rarely used in project management. An example would be roofing a home, and the two tasks: add roofing, supervise the work. In this case, the roofing can start, but the supervisor needs to show up at some point before the end of the roofing.