SciELO - Scientific Electronic Library Online

 
vol.19 número1Using the population-based incremental learning algorithm with computer simulation: Some applicationsComputerised information systems: Comparison of relative impacts on planned project duration within a multi-project environment índice de autoresíndice de materiabúsqueda de artículos
Home Pagelista alfabética de revistas  

Servicios Personalizados

Articulo

Indicadores

Links relacionados

  • En proceso de indezaciónCitado por Google
  • En proceso de indezaciónSimilares en Google

Compartir


South African Journal of Industrial Engineering

versión On-line ISSN 1012-277X

S. Afr. J. Ind. Eng. vol.19 no.1 Pretoria  2008

 

Buffer sizing for the critical chain project management method

 

 

A. GeekieI; H. SteynII

ISasol Technology Project Management, Sasol Technology, South Africa adrian@geekiegroup.com
IIDepartment of Engineering and Technology Management, University of Pretoria, South Africa herman.steyn@up.ac.za

 

 


ABSTRACT

Methods for sizing project and feeding buffers for critical chain project management are investigated. Experiments indicate that - in the absence of bias, and for certain classes of bias - buffer consumption is independent of the mean duration of a chain. Generally the popular method - a buffer size equal to 50% of the longest path leading to it - gives rise to excessively large buffers. Buffers sized according to the square root of the sum of squares perform well in the absence of bias, but with bias present the performance is unacceptably poor. A new approach to buffer sizing is proposed.


OPSOMMING

Metodes vir groottebepaling van projek- en saamvloeibuffers vir kritieke-ketting projekbestuur word ondersoek. Eksperimente dui daarop dat - in die afwesigheid van onewewigtigheid, en vir sekere tipes onewewigtigheid - bufferverbruik onafhanklik is van die gemiddelde lengte van 'n ketting. Oor die algemeen veroorsaak die metode van buffergrootte - gelyk aan 50% van die langste pad wat tot die buffer lei - onnodige groot buffers. Buffers bepaal met die metode van die vierkantswortel van die som van kwadrate, vaar goed in die afwesigheid van onewewigtigheid, maar vaar onaanvaarbaar swak wanneer onewewigtigheid teenwoordig is. 'n Nuwe metode vir die bepaling van buffergrootte word voorgestel.


 

 

“Full text available only in PDF format”

 

 

REFERENCES

[1] Goldratt, E.M. 1997. Critical chain. The North River Press, Great Barrington MA.         [ Links ]

[2] Tukel, O.I., Rom, W. R. & Duni Eksioglu, S. 2006. An investigation of buffer sizing techniques in critical chain scheduling, European Journal of Operational Research, 172, 401-416.         [ Links ]

[3] Leach, L.P., 2005. Critical chain project management. 2nd edition, Artech House, Inc., Norwood MA.         [ Links ]

[4] Moder, J.J. a Philips, C.R. 1985. Project management with CPM and PERT. Van Nostrand Reinhold Co., London.         [ Links ]

[5] Shou, Y. & Yeo, K.T. 2000. Estimation of project buffers in critical chain project management, Proceedings of the IEEE international conference on management of innovation and technology. ICMIT, 162-167.         [ Links ]

[6] Trietsch, D. 2005. The effect of systemic errors on optimal project buffers, International Journal of Project Management, 23, 267-274.         [ Links ]

[7] Herroelen, W. & Leus, R. 2001. On the merits and pitfalls of critical chain scheduling, Journal of Operations Management, 19, 559-577.         [ Links ]

[8] Software developed by Decision Support Services and available from http://www.decisiontoolpak.com        [ Links ]

[9] Miller, I., Freund, J.E. & Johnson, R.A. 1990. Probability and statistics for engineers. Prentice-Hall Inc., Englewood Cliffs, NJ.         [ Links ]

[10] Swokowski, E.W. 1998. Calculus with analytic geometry. Second alternate edition. PWS Kent Publishing, Boston MA.         [ Links ]

[11] Steyn, H. 2003. Comparisons between and combinations of different approaches to accelerate engineering projects, South African Journal of Industrial Engineering, 14 (2), 63-74.         [ Links ]

[12] Malcolm, D.G., Roseboom, J.H., Clark, C.E. & Fazar, W. 1959. Application of a technique for research and development program evaluation, Operations Research, 7 (5), 646-669.         [ Links ]

 

 

1 The author was enrolled for the MPM programme at the Department of Engineering and Technology Management, University of Pretoria

Creative Commons License All the contents of this journal, except where otherwise noted, is licensed under a Creative Commons Attribution License