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.