Creation of the Critical Path Arrow Diagram

The only dimension used in the arrow diagram is task time. As with the Gantt chart, days or weeks are measured horizontally. Reading from the Gantt chart, you should identify each task with no predecessor. Lay a line for each one, beginning at Day zero, extending it to the right for the required number of days. The arrow does not need to be horizontal. Its horizontal component, however, must equal the task duration of the represented task.

The first task(s) should be laid out beginning about halfway up the vertical side of the page: One may extend diagonally upward, another diagonally downward (see Figure 7-3). Others will follow. This layout spreads out the arrow diagram, which is visually useful as ...

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