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(I) Five Characteristic of
Repetitive Activities
1
FIVE CHARACTERISTICS
OF REPETITIVE ACTIVITIES
Modeling Repetitive Activities
Presented by
Chachrist Srisuwanrat
2008
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(I) Five Characteristic of
Repetitive Activities
2
CHARACTERISTICS OF
REPETITIVE ACTIVITIES
1. Deterministic and Non-Deterministic Duration
Activities
2. Typical and Non-Typical Activities
3. Repetitive and Non-Repetitive Activities
4. Resource-Sharing Activities
5. Hard and Soft Logic Dependencies
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(I) Five Characteristic of
Repetitive Activities
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1) Deterministic and Non-
Deterministic Duration Activities
A1
A2
A3 B3
B1
B2
1 2 3 4 5 6 7 8 9 10
3 2 1
Unit
C3
C3
C2
A1
A2
A3 B3
B1
B2
1 2 3 4 5 6 7 8 9 10
3 2 1
Unit
C3
C3
C2
A1
A2
A3 B3
B1
B2
1 2 3 4 5 6 7 8 9 10
3 2 1
Unit
C3
C3
C2
Idle Time
WHAT IS THE IDLE TIME FOR EACH ACTIVITY?
HOW MANY DAYS SHOULD ACTIVITIES BE DELAYED?
ARE YOU CONFIDENT WITH YOUR DECISION?
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(I) Five Characteristic of
Repetitive Activities
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2) Example of Typical and Non-
Typical Repetitive Activities
A1
A2
A3 B3
B1
B2
Time 1 2 3 4 5 6 7 8 9 10 (a) Typical Activities
Time 1 2 3 4 5 6 7 8 9 10 (b) Non-Typical Activities
Unit
3
2
1
Unit
3
2
1
C3
C1
C2
A3
A1
A2
B3
B1
B2
C3
C1
C2
(For examples, work amounts, production rates, crew sizes)
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(I) Five Characteristic of
Repetitive Activities
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3) Examples of Repetitive and
Non-Repetitive Activities
A B
C2
Time 1 2 3 4 5 6 7 8 9 10
(a) Production Diagram for the case
activity only exists in the first unit
Time 1 2 3 4 5 6 7 8 9 10
(b) Production Diagram for the case
sub-activities does not exist in all units
Unit Unit
3
2
1
D3
D1
C2
A3
A1
A2
B3
B1 C1
C2
D3
D1
D2
C1
D2
3
2
1
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(I) Five Characteristic of
Repetitive Activities
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4) Resource-Sharing Activities
Two activities sharing the
same resource
Two sub-activities (same
activity) sharing the same
resource
Sharing resource concurrently
or not concurrently
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(I) Five Characteristic of
Repetitive Activities
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5) Example of Hard and Soft Logic
Dependencies
A1
A3
B1
B3
C1
A2 C2
C3
D1
D2
D3
E1
E2
E3
Time (months) 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20
Switching the order between E2 and E3
Units 3 2 1
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(I) Five Characteristic of
Repetitive Activities
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5) Example of Soft Logic
Dependencies (Cont.)
A1
A3
B1
B3
C1
A2 C2
C3
D1
D3
D2
E1
E3
E2
Time (months) 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Switching the order between units 2 and 3
Units 3 2 1
For example, housing projects (e.g., House ID1, House ID2, House ID3).