Precedence diagram method: Difference between revisions

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The '''Precedenceprecedence Diagramdiagram method Method(PDM)''' is a tool for [[Schedule (project management)|scheduling]] activities in a [[project plan]]. It is a method of constructing a project schedule network diagram that uses boxes, referred to as nodes, to represent activities and connects them with arrows that show the [[Dependency (project management)|dependencies]]. It is also called the activity-on-node (AON) method.

* Critical Tasks[[Task (project management)|tasks]], noncritical tasks, and slack time

* Shows the relationship of the tasks to each other

* Allows for what-if, worst-case, best-case and most likely scenario

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Key elements include determining predecessors and defining attributes such as

* early start date

* late start date

* last-last

* early finish date

* late finish date

* duration

* Duration

* activity name

* WBS reference

* [[Work breakdown structure|WBS]] reference

Slack/[[Float (project management)|Float]]: Determines the duration of activity delay that the project can tolerate before the project comes in late. The difference between the earliest and the latest start time.{{sfn|Kerzner|2009}}{{rp|502}}{{sfn|Sanghera|2019}}{{rp|183}} i.e. Slack = latest start date - earliest start day or Slack = latest finish time - earliest finish time.

== See also ==

* [[Arrow Diagramming Method]]

Any activities which have a slack of 0, they are on the [[Critical path method|critical path]].

[[File:TinhSoDoMangPDM.png|thumbnail|right|solving the PDM, with: BS is an early start date. BM is a late start date. KS is an early finish date. KM is a late finish date.]]

Different Precedence diagram Methods

* [[Arrow Diagrammingdiagramming Methodmethod]]

* [[Project network]]

* [[Critical -path method]]

* [[Gantt chart]]

* [[Program Evaluationevaluation and Reviewreview Techniquetechnique]]

==References==

{{Reflist}}

== Further reading ==

*{{cite book | author = Kerzner, Harold | year = 2009 | title = Project Management: A Systems Approach to Planning, Scheduling, and Controlling |edition = 10th | publisher = Wiley | isbn = 978-0-470-27870-3| author-link = Harold Kerzner }}

* {{cite book | last = Sanghera| first = Paul | year = 2019| title=PMP in Depth |edition = Third | publisher = Apress | isbn = 978-1-4842-3910-0 | doi=10.1007/978-1-4842-3910-0 | language=en-US}}

==External links==

* [http://www.betterprojects.net/2005/10/pdms-precedence-diagram-method.html Precedence Diagram Method] at Better Projects

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[[Category:Project management]]

[[Category:Project management techniques]]

[[de:Netzplantechnik]]

[[Category:Schedule (project management)]]

[[es:Método del diagrama de precedencias]]