Exam Spotlight

For the exam, remember that the PDM uses only one time estimate to determine duration.

The following graphic shows a PDM—or AON—of the house-painting example.

The PDM is further defined by four types of logical relationships. The terms dependencies and precedence relationships also are used to describe these relationships. You might already be familiar with these if you've used Microsoft Project or similar project management software program. The four dependencies, or logical relationships, are as follows:

Finish-to-start (FS) The finish-to-start relationship is the most frequently used relationship. This relationship says that the predecessor—or from activity—must finish before the successor—or to activity—can start. In PDM diagrams, this is the most often used logical relationship.

Start-to-finish (SF) The start-to-finish relationship says that the predecessor activity must start before the successor activity can finish. This logical relationship is seldom used.

Finish-to-finish (FF) The finish-to-finish relationship says that the predecessor activity must finish before the successor activity finishes.

Start-to-start (SS) I think you're getting the hang of this. The start-to-start relationship says that the predecessor activity depends on starting before the successive activity can start.

Project Management Made Easy

Project Management Made Easy

What you need to know about… Project Management Made Easy! Project management consists of more than just a large building project and can encompass small projects as well. No matter what the size of your project, you need to have some sort of project management. How you manage your project has everything to do with its outcome.

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