User's Guide to  

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Define Predecessors

To define different types of relationships between tasks use the four predecessor buttons located on the standard toolbar.

The four types of task 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).