YUSUF OZFATIH BOLUKBAS

HUSEYIN ANIL KARABULUT

NETWORK AND BLOCK DIAGRAMS

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)

AOA for Computer Institute

AON for Computer Institute

DependencyFS = Finish to StartSS = Start to StartFF = Finish to FinishSF = Start to Finish

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.

IMPORTANCE OF BLOCK DIAGRAMS

Identification the system

Visualization the system

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

Requirements

System

ElementsInterfaces – Internal & External

Contributors / Other Aspects

Process makes it possible,

people make it happen.

REFERENCES

http://www.super-business.net/IT-Project-Management/172.html

http://www.michelbeauregard.com/msProjectnetworkDiagram.pdf

http://thequalityportal.com/q_block.htm

THANKS…