1. BAR CHART Develop by Henry Gantt. Definitions Activity
A graphical description of the project consisting of well-defined collection of tasks.
Activity
An activity is a task or closely related group of tasks whose performance contributes to the completion of the overall project. “Excavate Foundation”.
Prof. Awad Hanna

2. BAR CHARTS ORGANIZATION
Item Activity
M10 Mobilization
Bars
(Month or Year)
Prof. Awad Hanna

3. CONSTRUCTION THE BAR CHART
When constructing a bar chart, the following questions must be answered:
1. What time units should be used?
2. Should work days or calendar days be used?
3. What about non continuous work?
Additional information may be added to the basic bar chart such as activity value, cost and resource requirements.
Prof. Awad Hanna

4. TYPE OF BAR CHART
Type I
Linear time-scaled for planning, Linear progress-scaled for reporting
Assume the progress of the activity as a direct-linear function of the elapsed time.
For this example
Five months were originally scheduled for this activity.
Reporting date at 3rd month, 60% of the elapsed time.
Activity behind by 10% “May or may not be true”.
Prof. Awad Hanna

5. Type I Bar Charts Jan Feb Mar Apr May (a) Type I Plan Bar Jan Feb Mar
Reporting date
(b) Type I Reporting: Version 1
Jan
Feb
Mar
Apr
May
Reporting date
(c) Type I Reporting: Version 2
Prof. Awad Hanna

6. TYPE OF BAR CHART (cont.)
Type II
Time scaled for planning - Time scaled for reporting.
Planned cumulative progress % are written at the end of each time interval.
No linearity
the reporting bar gives no implication about the actual progress.
Prof. Awad Hanna

7. Type II Bar Charts Jan Feb Mar Apr May (a) Type II Plan Bar Jan Feb
Scheduled program 10 30 50 80
100
Original schedule
(a) Type II Plan Bar
Jan
Feb
Mar
Apr
May 10 30 50 80
100
Actual Time Work 8 28 55
Actual Progress
Reporting date
(b) Type II Reporting: Case 1
Jan
Feb
Mar
Apr
May
Jun
Jul 10 30 50 80
100 8 28 55 75 90 96
Reporting
date
(b) Type II Reporting: Case 2
Prof. Awad Hanna

8. BAR CHART ADVANTAGES AND DISADVANTAGES
Easy to prepare
Easily understood by all parties
It shows the total plan in impact form.
Good communication tool
Disadvantages
Do not show interrelationships between activities
Managing projects becomes difficult without those relationships between activities
It is difficult to judge the impact of an unexpected event on the rest of the construction process
Prof. Awad Hanna