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| ''Developed by Behzad Sanie''
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| == Abstract ==
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| The precedence diagramming method (PDM) includes four types of independencies or logical relationships. <ref name="pdm"/>
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| PDM is a tool for programming activities in planning a project. It is a method of constructing a network diagram of the project schedule that uses boxes, called nodes, to represent the activities and connects them with arrows that show the dependencies.
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| PDM, In a network technology project, focuses on the precedence of activities and logical relationships. It is also known as the activity-on-node or AON and used by many project management software packages.
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| PDM, In a network technology project, focuses on the precedence of activities and logical relationships. It is also known as the activity-on-node or AON and used by many project management software packages.
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| == Types of dependencies ==
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| Four types of dependencies or logical relationship are linking predecessor activity and successor activity together in PDM. Predecessor activity comes before successor activity which is logically a depended activity in a schedule planning. Example: collecting data in a software project management is a predecessor activity and analysing the data is a successor activity.
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| An activity must be time bound with a start and end time. This time bounding acquires the four types of dependencies between predecessor and successor which defined below:
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| *'''Finish-to-start (FS)''': A successor activity can start when a predecessor activity has finished. Example: building the walls (successor) in a house cannot start before finish the foundation (predecessor).
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| *'''Finish-to-finish (FF)''': A successor activity can finish when a predecessor activity has finished. Wall construction (predecessor) is required to finish before electrical wiring (successor) inside the walls can finish.
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| *'''Start-to-start (SS)''': A successor activity cannot start if a predecessor activity has not begun.
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| *'''Start-to-finish (SF)''':
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| == Reference ==
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| <references>
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| <ref name="pdm">Project Management Institute. (2013). ''A guide to the project management body of knowledge (PMBOK® Guide)''. 5th ed. Pennsylvania: Project Management Institute, pp. 156-159.</ref>
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