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Dependency links

Dependency links. You can use four types of task dependencies (or links ) to define the relationships between tasks in your Project plan. . If you link tasks, Project will automatically adjust your schedule when any part of your plan changes.

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Dependency links

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  1. Dependency links You can use four types of task dependencies (or links) to define the relationships between tasks in your Project plan. If you link tasks, Project will automatically adjust your schedule when any part of your plan changes. If instead you enter specific start and finish dates for tasks, you override that automatic adjustment. So you see the advantage to understanding how Project dependency types are used to link tasks. Linking Project tasks

  2. Linking tasks 101 After you define your plan’s tasks and estimate how long it will take to complete them, you’re ready to schedule the tasks by creating task dependency links. By default, Project schedules all tasks to begin on the project’s start date and calculates the project’s finish date based on the last task to finish. When you enter task dependencies, Project adjusts the schedule to assign more accurate dates to each task. Linking Project tasks

  3. Linking tasks 101 The picture illustrates the concepts. All tasks in a Project plan start at the project start date unless you specify otherwise. With no task dependencies or constraints applied, the project finish date is the same as the longest task’s finish date. Linking Project tasks

  4. Linking tasks 101 The picture illustrates the concepts. Task dependencies, such as the Finish-to-Start dependency between the first and second tasks (shown here), can change the project’s scheduled finish date. Linking Project tasks

  5. Predecessor tasks and successor tasks The four dependency types shown in the picture can help you schedule your real-world situation. A predecessor is a task whose start or finish date determines the start or finish date of its successor task. A successor is a task whose start or finish date is driven by its predecessor task. Linking Project tasks

  6. Predecessor tasks and successor tasks The four dependency types shown in the picture can help you schedule your real-world situation. The type of relationship between a predecessor task and a successor task determines the type of task dependency to use. Linking Project tasks

  7. Finish-to-Start dependencies When the work of Task 2 can start only after all the work of Task 1 is finished, the tasks have a Finish-to-Start (FS) dependency. The FS dependency is created by default when you link two tasks in Project. The order in which you select the tasks treats the first as the predecessor, the second as the successor. Task 1 is the predecessor of Task 2, and Task 2 is the successor of Task 1. Linking Project tasks

  8. Start-to-Start dependencies When the work of Task 2 cannot start until Task 1 starts, the tasks have a Start-to-Start (SS) dependency. In the real world, SS dependencies generally occur because you want the work of two tasks to overlap. For example, “Level concrete” (Task 2) can’t begin until “Pour foundation” (Task 1) begins. Linking Project tasks

  9. Start-to-Start dependencies Overlapping work also helps to reduce the overall duration of a project. If Task 1 will take 10 days to complete, and Task 2 will take 5 days to complete, and you set an FS dependency, the overall duration of the two tasks is 15 days. If you set an SS dependency, the overall duration of the two tasks is only 10 days (the time required by Task 1). Linking Project tasks

  10. Finish-to-Finish dependencies When the finish date of Task 1 determines the finish date of Task 2, they have a Finish-to-Finish (FF) dependency. For example, “Inspect electrical” (Task 2) can’t finish until “Add wiring” (Task 1) finishes. Linking Project tasks

  11. Finish-to-Finish dependencies Like SS dependencies, FF dependencies reduce the overall amount of time it takes to complete work on two tasks, if the work can overlap or be done in parallel. If Task 1 will take 10 days to complete, and Task 2 will take 5 days to complete, and you set an FS dependency, the overall duration of the two tasks is 15 days. If you set an FF dependency, the overall duration of the two tasks is only 10 days (the time required by Task 1). Linking Project tasks

  12. Start-to-Finish dependencies When the start date of Task 1 determines the finish date of Task 2, the tasks have a Start-to-Finish (SF) dependency. This is how you create just-in-time scheduling. Say a related task needs to finish before a milestone or project finish date, but it doesn’t matter when and you don’t want a late finish to affect the just-in-time task. Create an SF dependency between the task you want scheduled just in time (the predecessor) and its related task (the successor). Linking Project tasks

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