The Impact of Upgrades on ERP System Reliability

Constant upgrading of Enterprise Resource Planning (ERP) systems is necessary, but can cause new defects. This paper attempts to model the likelihood of defects after completed upgrades with Weibull defect probability density function (PDF). A case study is presented analyzing data of recorded defects obtained for one ERP subsystem. The trends are observed for the value of the parameters relevant to the proposed statistical Weibull distribution for a given one year period. As a result, the ability to predict the appearance of defects after the next upgrade is described.

Authors:

• F. Urem
• K. Fertalj
• I. Livaja

Keywords:

• ERP
• upgrade
• reliability
• Weibull model

References:

[1] Michael R. Lyu, ÔÇ×Handbook of Software Reliability Engineering",
Computer Society Press. ISBN:0-07-039400-8. 1996
[2] Lehman, Meir M. (1980). "Programs, Life Cycles, and Laws of Software
Evolution". Proc. IEEE 68 (9): 1060-1076
[3] Hribar L., Duka D., "Software component quality prediction in the
legacy product development environment using Weibull and other
mathematical distributions ", SoftCOM 2009. , Page(s): 254-259
[4] Weibull, W.,"A statistical distribution function of wide applicability",
1951.,J. Appl. Mech.-Trans. ASME 18 (3): 293-297
[5] EasyFit Distribution Fitting Software, www.mathwave.com
[6] Frane Urem, Želimir Mikulić, "Using NHHP model for ERP software
module reliability growth", MIPRO 2010, , Proceedings of the 33rd
International Convention,page(s): 165-168