bar chart

Spring 2008, King Saud University

Bar ChartDr. Khalid Al-Gahtani

1

What is Activity• An activity or task is a given kind and

amount of work which:– Consumes time– Consumes Resources– has a definable beginning and ending

Fixing False Sealing

3 men x 30 days Start time 3000 board type End time



2

What is Project

• A project is a set of activities with– A well-defined objective(s)– A target completion date– An estimated budget

Plans &

Specifications

Limited Resources

Project Management

Required Product

Project Objectives Given Desired



3

Type of Schedule

• Written Schedule• Gantt Chart (Bar Chart)• CPM Schedules (Critical Path Method)

– Activity on Arrow– Activity on Node AB

• PERT

• LSM (Linear Schedule Method)

A B

A 5

X =36 40 30



4

Bar Chart • STEPS

– Analyze the project and specify the basic approach to be used.

– Break the project down into a reasonable number of activities to be scheduled.

– Estimate the time required to perform each activity.– Place the activities in sequence of time, taking into

account the requirements that certain activities must be performed sequentially.

• Logical constrain• Resources constrain

– If a completion date is specified, the diagram is adjusted until this constraint is satisfied.



5

Bar Chart• Example:

Activity ID

Activity Description Dependency Duration

A Excavation 3

C Foundation A 3

D Column B, C 2

B Moving the soil out A 2

E Wall C, D 5

F Roof E, D 5



6

Solution

A

C

D

B

E

F 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18



7

Alternative Solution

A

B

C

D

E

F 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18



8

Bar Chart• Advantages of Bar Chart

– Very Graphical– Easy to understand– Most widely used

• Disadvantages of Bar Chart– Difficult to Update– Difficult to find the Critical Path– Difficult to setup and maintain a large project because

it is essentially a manual graphical procedure.



9

How to identify the Critical path in a Bar Chart

• Types of a Project Activity– Critical Activity: if it is delayed, it will delay the

project.– Noncritical Activity: it may not delay the

project if it’s well managed.



10

STEPS to identify the Critical Path

• Start with the last Activity; Draw a vertical line from the i Node of late Activity.

• The activities whose j nodes touch the vertical line, are Potential Critical Activity.

• Draw a vertical line from the i node of the new critical activity.

• Proceed in this manner until you reach Day 0.

i j



11

A

B

C

D

E

F 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18

Identify the Critical Path



12

Class WorkActivity Depends upon Duration (Weeks)

A C, J 3 B F 2 C F 3 D C, I 4 E G 5 F H 4 G H 2 H - 3 I E, F 4 J B 2



13

CW SolutionAct. W1 W2 W3 W4 W5 W6 W7 W8 W9 W10 W11 W12 W13 W14 W15 W16 W17 W18

H F G E I B C J A D

bar chart

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