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BAR CHART. Develop by Henry Gantt. Definitions A graphical description of the project consisting of well-defined collection of tasks. Activity

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bar chart
BAR CHART
  • Develop by Henry Gantt.
  • Definitions

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

bar charts organization
BAR CHARTS ORGANIZATION

Item Activity

M10 Mobilization

Bars

(Month or Year)

Prof. Awad Hanna

construction the bar chart
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

type of bar chart
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

type i bar charts
Type I Bar Charts

Jan

Feb

Mar

Apr

May

(a) Type I Plan Bar

Jan

Feb

Mar

Apr

May

Reporting date

(b) Type I Reporting: Version 1

Jan

Feb

Mar

Apr

May

Reporting date

(c) Type I Reporting: Version 2

Prof. Awad Hanna

type of bar chart cont
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

type ii bar charts
Type II Bar Charts

Jan

Feb

Mar

Apr

May

Scheduled program

0

10

30

50

80

100

Original schedule

(a) Type II Plan Bar

Jan

Feb

Mar

Apr

May

0

10

30

50

80

100

Actual Time Work

Actual Progress

0

8

28

55

Reporting date

(b) Type II Reporting: Case 1

Jan

Feb

Mar

Apr

May

Jun

Jul

0

10

30

50

80

100

75

90

96

0

8

28

55

Reporting

date

(b) Type II Reporting: Case 2

Prof. Awad Hanna

bar chart advantages and disadvantages
BAR CHARTADVANTAGES AND DISADVANTAGES
  • Advantages
    • 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