PDM is a method of constructing a project schedule network diagram that uses boxesor rectangles, referred to as nodes, to represent activities and connects them with arrows thatshow the dependencies.This method includes following types of dependencies or precedence relationships:F-S, the initiation of the successor activity, depends upon the completion of thepredecessor activity.（） , the initiation of the successor activity, depends upon the initiation of thepredecessor activity.

PDM is a method of constructing a project schedule network diagram that uses boxesor rectangles, referred to as nodes, to represent activities and connects them with arrows thatshow the dependencies.This method includes following types of dependencies or precedence relationships:F-S, the initiation of the successor activity, depends upon the completion of thepredecessor activity.（） , the initiation of the successor activity, depends upon the initiation of thepredecessor activity.