Precedence Diagram Method (PDM)

This method is the most common one. In this method, every activ­ity is presented by a box or a rectangle, as shown in Figure (4.5), and the detail of the rectangle is shown in Figure (4.6). The rect­angles are connected by the arrows, which represent the dependen­cies between the activities. From this figure, it is clear that activity (C) starts after activity (D) and (B).

Figure (4.6) presents the inside of a rectangle, which will note the duration, early start time (ES), early finish (EF) time, and also the latest start (LS) and latest finish (LF) time.