Here Are Some Tips on Setting Up Project Activity Sequences as Per the Diploma in Project Management
.1 Precedence Diagramming Method (PDM)
The precedence diagramming method (PDM) is the most common method of arranging the project work visually. The PDM puts the activities in boxes, called nodes, and connects the boxes with arrows. The arrows represent the relationship and the dependencies of the work packages.
The illustration below shows a simple network diagram using PDM:
PDM includes four types of dependencies or precedence relationships:
– Finish-to-Start (FS). This relationship means Task A must complete before Task B can begin. This is the most common relationship. For example, the foundation must be set before the framing can begin. The initiation of the successor activity depends upon the completion of the predecessor activity.
– Finish-to-Finish. This relationship means Task A must complete before Task B does. Ideally, two tasks must finish at exactly the same time, but this is not always the case. The completion of the successor activity depends upon the completion of the predecessor activity.
– Start-to-Start. This relationship means Task A must start before Task B can start. This relationship allows both activities to happen in tandem. The initiation of the successor activity depends upon the initiation of the predecessor activity.
– Start-to-Finish. This relationship is unusual and is rarely used. It requires that Task A start so that Task B may finish. Such relationships may be encountered in construction and manufacturing. It is also known as just-in-time (JIT) scheduling. The completion of the successor activity depends upon the initiation of the predecessor activity.
In PDM, finish-to-start is the most commonly used type of precedence relationship. Start-to-finish relationships are rarely used.
This technique is also called Activity-On-Node (AON) and is the method used by most project management software packages. It includes four types of dependencies or precedence relationships
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Published by: LMIT