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Adding a predecessor to a task

  1. Select the task to which you want to add a predecessor.
  2. Open the Task Information dialog box.
  3. Click the Predecessor tab.
  4. On the first row of the grid, click in the Task Name cell. A drop-down list appears containing a list of all available tasks or type
  5. Select the predecessor from the drop-down list. By default, the predecessor type is Finish- Start (FS).
  6. If required, enter a lag time. Use the Lag low and Lag high cells to enter a range of time. Lag can be positive or negative.
  7. If you are entering a base, high and low lag, you can change the default distribution using the drop-down list in the distribution cell.
    - f the low and high lags are different, the default distribution is triangular.
    - If low, base, and high lag are the same the distribution is undefined.
  8. If required, edit the Seed number. Seed is the starting parameter used for the random number generation that is used to calculate lag. If you have two predecessors, and they have strong positive correlations between their lags, you can make their seeds the same. For example, a low lag for one predecessor will coincide with a low lag for another predecessor.
  9. Click OK.

  • You cannot make a task be a predecessor to itself
  • You cannot create a schedule that it will lead to a circular relationship between tasks
  • You cannot link a summary task to one of its subtasks
  • You cannot link two tasks twice.
  • You can have two predecessors (SS and FF) to the same task.

See also

Adding constraints

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