YUSUF OZ FATIH BOLUKBAS HUSEYIN ANIL KARABULUT NETWORK AND BLOCK DIAGRAMS
Dec 24, 2015
What is Project Network Diagram?
A project network diagram is a pictorial representation of the sequence in which the project can be done.
Developed in the 1950’ to overcome the shortcoming of the Gantt Chart.
Superiority over Gantt Chart:
Displays detailed information on each work unit
Clearly reflects the order of tasks in multiple phases
Reflects the shortest path to completionReflects the best usage of resource
Helps of Network Diagrams
Network diagrams help us in following way:
Finds our critical / non-critical activities.
Understand the types of activity dependencies and when they are used.
Ideal Situations of Network Diagrams
Network Diagrams are ideal for these situations:
Detailed project managementImplementation trackingContingency plansResource control
Types of Network Diagram
Arrow diagram (AOA – Activity on Arrow)
Precedence diagram (AON – Activity on Node)
ARROW DIAGRAMS
The arrow diagram shows the required order of tasks in a project or process
The arrow diagram lets you calculate the “critical path” of the project
WHEN TO USE ARROW DIAGRAMS
When scheduling and monitoring tasks of a complex project with interrelated tasks and resources.
When you know the steps of the project or process
When project schedule is critical, with serious results for completing the project late or early
ARROW DIAGRAM PROCEDURE
List all the necessary tasks in the project or process
Determine the correct sequence of the tasks
Diagram the network of tasks
Between each two tasks, draw circles for “events.”
Look for three common problem situations and redraw them using “dummies” or extra events
DUMMY ACTIVITY?
A dummy is an arrow drawn with dotted lines used to separate tasks that would otherwise start and stop with the same events or to show logical sequence
Dummy separating simultaneous tasks
BLOCK DIAGRAMS
The block diagram is a simple pictorial representation of a system or sub-systems to illustrate the relationships between sub-systems.
WHEN TO USE BLOCK DIAGRAMS?
Establish the boundaries of a system under consideration
Outline the elements contained within the scope of a task
Identify inputs and outputs for components within a system
Identify relationships between systems or components
Establish critical paths through systems
HOW TO USE BLOCK DIAGRAMS?
Construct the initial diagram using pencil and paper then transfer to the computer
Space blocks far apart, leave enough space to add more blocks when needed
Start at the input to the system and follow the path
REFERENCES
http://www.super-business.net/IT-Project-Management/172.html
http://www.michelbeauregard.com/msProjectnetworkDiagram.pdf
http://thequalityportal.com/q_block.htm