1. Network Diagrams
Project Management

2. Introduction to Network Diagrams
• A network diagram is a flow chart of all tasks which make up
a project
• The chart demonstrates how each task relates to another
• Provides a logical flow of events
• Commonly used
• Network Diagrams are made up of a collection of task
dependencies known as Network Logic i.e. some tasks are
dependent on others

3. Creating Network Diagrams
1.
2.
3.
4.
Determine the activities which need to be completed
Put these activities into sequence
Calculate how long each activity should take
Establish dependencies i.e. tasks which depend on the
completion of a previous task
5. Establish which tasks are to be completed first, any tasks
with no predecessors can start as soon as the project
begins

4. Drawing the Network Diagram
1. Begin drawing the diagram by drawing the relationship between
the project start and the first activity with no predecessor
Start
T=0
AcActivity 1
T=x
2. Then find all activities which have activity 1 as a predecessor
3. Draw boxes to represent these activities, and draw arrows from
activity 1 to these activities

5. Drawing the Network Diagram
4. Repeat these steps for the remaining activities
5. After adding all the activities to the diagram, draw a box to
represent End, and draw an arrow from the last activity you
have to complete to that box

6. Sample Network Diagram

7. Sample Network Diagrams

8. Network Diagrams
• Establish which tasks must be completely individually and
which can be completed simultaneously
• Completing tasks simultaneously can shorten the length of
the project

9. Benefits of Network Diagrams
• Easy to read and understand
• Clearly highlights the sequence of tasks in the project
• Conveys parallel activities
• Demonstrates the links between each task
• Highlights which activities are critical
• Shows where float can exist

10. Disadvantages of Network Diagrams
• The can become very complex for large projects with many activities
• They can be time consuming to produce
• Can be costly to produce
• Tasks may be missed out, affecting the whole diagram

11. Video Example
• This video shows how to draw a network diagram from a Work
Breakdown Structure
• In addition it shows how to calculate project task durations and
provides another example of the Critical Path Method
• http://www.youtube.com/watch?feature=player_detailpage&v=URdx
hl_8qIE

12. Further Reading
• Schwalbe, K. (2008). Introduction to project management.
Cengage Learning, 2nd ed. – Chapter 4

13. References
• Holland and Holland Eterprises LTD, 2013. The Network Diagram bringing order to project work flows. [Online] Available at:
http://www.successful-project-management.com/networkdiagram.html [Accessed 07/11/13]
• Rick A. Morris, 2013. The Network Diagram- Project Management.
[Online] Available at: http://www.netplaces.com/projectmanagement/creating-the-schedule/the-network-diagram.htm
[Accessed 07/11/13]