Modeling of LOB scheduling with learning development effect

ABSTRACT Several techniques have been used to schedule repetitive projects; the most widely one is Line-Of-Balance (LOB). The primary advantage of LOB is maintaining work continuity, which leads to maximizing learning development effect and minimizing idle time of crews. While LOB is basically applicable to repetitive projects, learning development effect that naturally inherent with repetition is usually ignored. Several mathematical models, or learning curves, have been developed to investigate variation in productivity as a function of the number of units produced. The most practical and used one is the straight-line model. In this paper, learning development effect is incorporated into traditional LOB scheduling. The basic equation of LOB technique has been modified to consider learning development effect, in which straight-line learning curve model is adopted. An example project is used to demonstrate model calculations and obtained results are then analyzed. The developed model has been applied on a real-life project in order to demonstrate its applicability and practicality. Incorporating learning development effect into LOB scheduling provides for more realistic forecast of repetitive projects duration and/or cost. The proposed model provides both academics and practitioners with an effective tool for scheduling repetitive projects based on realistic assumptions.

[1]  Denise Gravitt.  Location‐Based Management for Construction: Planning, Scheduling and Control , 2011 .

[2]  Ibrahim M. Mahdi.  A new LSM approach for planning repetitive housing projects , 2004 .

[3]  Robert I. Carr,et al.  Planning Construction of Repetitive Building Units , 1974 .

[4]  Al Sarraj,et al.  Formal Development of Line‐of‐Balance Technique , 1990 .

[5]  J. G. Everett,et al.  LEARNING CURVES: ACCURACY IN PREDICTING FUTURE PERFORMANCE , 1997 .

[6]  David Arditi,et al.  Line‐of‐Balance Scheduling in Pavement Construction , 1986 .

[7]  Oldrich Stradal,et al.  Time Space Scheduling Method , 1982 .

[8]  Mohammad A. Ammar.  LOB and CPM Integrated Method for Scheduling Repetitive Projects , 2013 .

[9]  Amy Jones.  Line of balance , 2009 .

[10]  George S. Birrell.  Construction Planning—Beyond the Critical Path , 1980 .

[11]  Khaled A El-Rayes,et al.  Resource-driven scheduling of repetitive activities , 1998 .

[12]  H. Randolph Thomas,et al.  LEARNING CURVE MODELS OF CONSTRUCTION PRODUCTIVITY , 1986 .

[13]  T. Hu,et al.  Understanding the effect of the learning-forgetting phenomenon to duration of projects construction , 2001 .

[14]  Photios G. Ioannou,et al.  Scheduling projects with repeating activities , 1998 .

[15]  Simaan M. AbouRizk,et al.  MODELING AND SIMULATING LEARNING DEVELOPMENT IN CONSTRUCTION , 1992 .

[16]  Olli Seppänen,et al.  Location-based management of construction projects: Part of a new typology for project scheduling methodologies , 2009, Proceedings of the 2009 Winter Simulation Conference (WSC).

[17]  James R. Wilson,et al.  Simulation of Learning Development in Repetitive Construction , 1994 .

[18]  David W. Johnston.  LINEAR SCHEDULING METHOD FOR HIGHWAY CONSTRUCTION , 1981 .

[19]  James J. O'Brien,et al.  Network scheduling variations for repetitive work , 1985 .

[20]  Onur Behzat Tokdemir,et al.  Effect of learning on line-of-balance scheduling , 2001 .

[21]  José M. Cardoso Teixeira,et al.  Using linear model for learning curve effect on highrise floor construction , 2005 .

[22]  Adib Mustafa Hijazi.  Simulation analysis of linear construction processes , 1989 .

[23]  van Hpg Henny Ooijen.  Line-of-balance , 2003 .

[24]  Richard Neale,et al.  CPM/LOB: New Methodology to Integrate CPM and Line of Balance , 1994 .

[25]  Mario Vanhoucke.  WORK CONTINUITY CONSTRAINTS IN PROJECT SCHEDULING , 2006 .