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PERT & GANTT CHARTS An Introduction
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Program Evaluation & Review Technique (PERT) -
Is used in planning & organising phase of a project. Uses task times & dependencies to determine the sequence of events & how they control how long the project will take – critical path. Booz Allen Hamilton 1958 – Working on US Naval Contract
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PERT Diagram - Purpose Purpose
To determine the overall project cumulative elapsed time To determine ways to allocate resources to reduce project cumulative elapsed time
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PERT DIAGRAM - Process Step 1 – Task Table
Step 2 – Diagram & Dependencies Step 3 – Task Execution Times Step 4 – Cumulative Elapsed Time Step 5 – Critical Path Step 6 – Reduce Project Time
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PERT STEP 1 – Task Table TASK ID DEPENDENCIES UNITS (DAYS) A Start 2 B
4 C 6 D 5 E C,D 3 F G E,F Finish
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PERT Step 2 – Diagram & Dependencies
B F START FINISH A C E G D
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PERT Step 2 – Diagram & Dependencies
B F START FINISH A C E G D
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PERT Step 2 – Diagram & Dependencies
B F START FINISH A C E G D
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PERT Step 2 – Diagram & Dependencies
B F START FINISH A C E G D
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PERT Step 3 – Task Execution Times
B4 F4 START FINISH A2 C6 E3 G2 D5
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PERT Step 4 Cumulative Elapsed Time
B4 F4 START FINISH A2 C6 E3 G2 D5
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PERT Step 4 Cumulative Elapsed Time
B4 F4 START FINISH A2 C6 E3 G2 2 D5
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PERT Step 4 Cumulative Elapsed Time
6 B4 F4 START FINISH A2 C6 E3 G2 2 D5
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PERT Step 4 Cumulative Elapsed Time
6 B4 F4 8 START FINISH A2 C6 E3 G2 2 D5
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PERT Step 4 Cumulative Elapsed Time
6 B4 F4 8 START FINISH A2 C6 E3 G2 2 7 D5
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PERT Step 4 Cumulative Elapsed Time
6 B4 F4 10 8 START FINISH A2 C6 E3 G2 2 7 D5
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PERT Step 4 Cumulative Elapsed Time
6 B4 F4 10 8 START FINISH A2 C6 E3 G2 11 2 7 D5
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PERT Step 4 Cumulative Elapsed Time
6 B4 F4 10 8 13 START FINISH A2 C6 E3 G2 11 2 7 D5
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PERT Step 4 Cumulative Elapsed Time =13
6 B4 F4 10 8 13 START FINISH A2 C6 E3 G2 11 2 7 D5
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PERT Step 5 - Critical Path
6 B4 F4 10 8 13 START FINISH A2 C6 E3 G2 11 2 7 D5
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PERT Step 5 - Critical Path
6 B4 F4 10 8 13 START FINISH A2 C6 E3 G2 11 2 7 D5
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PERT Step 5 - Critical Path
6 B4 F4 10 8 13 START FINISH A2 C6 E3 G2 11 2 7 D5
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PERT Step 5 - Critical Path
6 B4 F4 10 8 13 START FINISH A2 C6 E3 G2 11 2 7 D5
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PERT Step 5 - Critical Path
6 B4 F4 10 8 13 START FINISH A2 C6 E3 G2 11 2 7 D5
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PERT Step 6 – Reduce Project Time
B4 F4 10 8 13 START FINISH A2 C6 E3 G2 11 2 7 D5
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PERT Step 6 – Reduce Project Time
B4 F4 10 8 13 START FINISH A2 C6 E3 G2 11 2 7 D5
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PERT – Stochastic PERT B 3-4-5 F 2-4-6 START FINISH A 1-2-3 C 5-6-7
10 8 13 START FINISH A 1-2-3 C 5-6-7 E 2-3-4 G 1-2-3 11 2 7 D 3-5-7
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D 3-5-7 PERT – Stochastic PERT B 3-4-5 F 2-4-6 START FINISH A 1-2-3
10 8 13 START FINISH A 1-2-3 C 5-6-7 E 2-3-4 G 1-2-3 11 2 7 D 3-5-7 D 3-5-7
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D 3-5-7 PERT – Stochastic PERT B 3-4-5 F 2-4-6 START FINISH A 1-2-3
10 8 13 START FINISH A 1-2-3 C 5-6-7 E 2-3-4 G 1-2-3 11 2 7 D 3-5-7 Optimistic D 3-5-7
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D 3-5-7 PERT – Stochastic PERT B 3-4-5 F 2-4-6 START FINISH A 1-2-3
10 8 13 START FINISH A 1-2-3 C 5-6-7 E 2-3-4 G 1-2-3 11 2 7 D 3-5-7 Optimistic Normal D 3-5-7
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D 3-5-7 PERT – Stochastic PERT B 3-4-5 F 2-4-6 START FINISH A 1-2-3
10 8 13 START FINISH A 1-2-3 C 5-6-7 E 2-3-4 G 1-2-3 11 2 7 D 3-5-7 Optimistic Normal Pessimistic D 3-5-7
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Gantt Chart Shows planning schedule of the tasks for the project
Shows progress to date First Used by Henry Gantt 1910
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Gantt Chart B4 F4 START FINISH A2 C6 E3 G2 D5 6 10 8 13 11 2 7 1 2 3 4
8 13 START FINISH A2 C6 E3 G2 11 2 7 D5 1 2 3 4 5 6 7 8 9 10 11 12 13 14 Days TASKS A B C D E F G
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Gantt Chart B4 F4 START FINISH A2 C6 E3 G2 D5 6 10 8 13 11 2 7 1 2 3 4
8 13 START FINISH A2 C6 E3 G2 11 2 7 D5 1 2 3 4 5 6 7 8 9 10 11 12 13 14 Days TASKS A B C D E F G
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Gantt Chart B4 F4 START FINISH A2 C6 E3 G2 D5 6 10 8 13 11 2 7 1 2 3 4
8 13 START FINISH A2 C6 E3 G2 11 2 7 D5 1 2 3 4 5 6 7 8 9 10 11 12 13 14 Days TASKS A B C D E F G
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Gantt Chart B4 F4 START FINISH A2 C6 E3 G2 D5 6 10 8 13 11 2 7 1 2 3 4
8 13 START FINISH A2 C6 E3 G2 11 2 7 D5 1 2 3 4 5 6 7 8 9 10 11 12 13 14 Days TASKS A B C D E F G
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Gantt Chart B4 F4 START FINISH A2 C6 E3 G2 D5 6 10 8 13 11 2 7 1 2 3 4
8 13 START FINISH A2 C6 E3 G2 11 2 7 D5 1 2 3 4 5 6 7 8 9 10 11 12 13 14 Days TASKS A B C D E F G
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Gantt Chart B4 F4 START FINISH A2 C6 E3 G2 D5 6 10 8 13 11 2 7 1 2 3 4
8 13 START FINISH A2 C6 E3 G2 11 2 7 D5 1 2 3 4 5 6 7 8 9 10 11 12 13 14 Days TASKS A B C D E F G
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Gantt Chart B4 F4 START FINISH A2 C6 E3 G2 D5 6 10 8 13 11 2 7 1 2 3 4
8 13 START FINISH A2 C6 E3 G2 11 2 7 D5 1 2 3 4 5 6 7 8 9 10 11 12 13 14 Days TASKS A B C D E F G
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Gantt Chart B4 F4 START FINISH A2 C6 E3 G2 D5 6 10 8 13 11 2 7 1 2 3 4
8 13 START FINISH A2 C6 E3 G2 11 2 7 D5 1 2 3 4 5 6 7 8 9 10 11 12 13 14 Days TASKS A B C D E F G
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Gantt Chart B4 F4 START FINISH A2 C6 E3 G2 D5 6 10 8 13 11 2 7 1 2 3 4
8 13 START FINISH A2 C6 E3 G2 11 2 7 D5 1 2 3 4 5 6 7 8 9 10 11 12 13 14 Days TASKS A B C D E F G
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Gantt Chart – C halved B4 F4 START FINISH A2 C3 E3 G2 D5 6 10 5 12 10
5 12 START FINISH A2 C3 E3 G2 10 2 7 D5 1 2 3 4 5 6 7 8 9 10 11 12 13 14 Days TASKS A B C D E F G
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