To define different types of relationships between tasks use the four predecessor A task that must start of finish before another task starts of finishes buttons located on the standard toolbar
Different types of task An activity or job which has a start date and time, an end date and time, a duration, and other properties. A Project is comprised of tasks. dependencies are show in the following figure:
To unlink tasks:
Click the Unlink 
button on the Standard
Toolbar.
Note:
If you want next task to be predecessor of previous task, for example task 5 to be a predecessor of task 3, you will have to use Predecessors tab in Task Information dialog box (see About Predecessors and Lags).
Remember the following rules:
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1. You cannot link summary task to one of its subtasks |
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2. The predecessors of a summary task must have a finish-start or start-start dependency. |
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3. You cannot create circular relationship |
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The connecting line between successors and predecessors will be red if there is a scheduling conflict:
See also
Overview of RiskyProject Workflow
