A short summary of existing repetitive project scheduling techniques reviewing how they tackle, model, and solve repetitive scheduling problems in construction projects by considering the following: 1. What method or tool is used? (graphical method, linear programming, simulation, object-oriented programming, dynamic programming? 2. Can it model non-typical activities? 3. Can it model non-repetitive activities? 4. Can it maintain continuity in resource utilization or eliminate idle time? 5. Can it model or introduce interruption in workflow or schedule work break in advance? 6. Can it model soft logic among repetitive units?

1. (II) Literature Review 1
LITERATURE REVIEW
Existing Repetitive Project
Scheduling Techniques
Presented by
Chachrist Srisuwanrat
2008

2. (II) Literature Review 2
Literature Review
 CPM and PERT cannot eliminate idle time.
 Line-of-Balance cannot model non-typical and
non-repetitive activities.
 Graphical Approach cannot solve non-
deterministic problem and not effective to
complicated problems.

3. (II) Literature Review 3
Literature Review (cont.)
 Linear Programming and Dynamic
Programming are not effective to solve non-
deterministic problem. (None of existing
techniques can solve non-deterministic
problem)
 Simulation cannot eliminate idle time. It cannot
guarantee the continuity in resource utilization.

4. (II) Literature Review 4
Literature Reviews
Researcher Year Technique
Non-
Typical
Activities
Non-
repetitive
Activities
Maintaining
Continuity
Non-
Deterministic
Duration
Interruption
options
Soft
Logic
1 Al Sarraj 1990 Graphical No N/A Yes No No No
2 Reda 1990 LP No No Yes No No No
3 Luts 1990 Simulation Yes N/A (Unit) Yes No No
4 Thabet 1992 Object-Oriented No No N/A No Yes No
5 El-Rayes 1993 DP Yes N/A Yes No No No
6 Suhail and Neale 1994 Graphical No No Yes No No No
7 Harmelink 1995 Graphical Yes Yes Yes No No No
8 Chehayep 1995 Simulation Yes Yes (Unit) Yes No No
9 El-Rayes 1997 Object-Oriented Yes Yes Yes No Yes No
10 Hijazi 1998 Simulation Yes No No Yes No No
11 El-Rayes 2001 DP Yes Yes Yes No Yes No
12 Yang 2002 Graphical Yes Yes Yes No No No
Chachrist 2008 Simulation YES YES YES!! YES YES!! YES

5. (II) Literature Review 5
Using the number of units to delay
activities to reduce idle time
Using 2 units of A
Using 3 units of A
Using time
1 2 3 4 5 6 7 8 9 10
A1
A2
A3
B3
B1
B2
3
2
1
Unit
Month
(a) Original schedule based on CPM
A1
A2
A3
1 2 3 4 5 6 7 8 9 10 11 12
3
2
1
Unit
B3
B1
B2
B3
B1
B2
B3
B1
B2
Month
(b) Modified schedule based on the number
of units and time