Modelling ERP/MRP and Common Inventory Policies

Francisco Perez · Post by **Francisco Perez** » Wed Jun 23, 2004 3:25 am

Hi everyone. I am doing some research about modelling the impact of
implementation of ERP/MRP strategies on inventory/logistics
operations, particularly taking into consideration the structure of
equivalent control mechanisms of ERP/MRP.

Has anyone been involved or does anyone know about modelling this
via system dynamics?

Thanks.
Francisco
From: Francisco Perez <francisco77pp@yahoo.com>

John Morecroft · Post by **John Morecroft** » Mon Jun 28, 2004 11:50 am

Francisco,
Some time ago I wrote a PhD thesis on this topic. The following journal
article is based on the thesis: ‘A Systems Perspective on Material
Requirements Planning’, Decision Sciences, vol 14, no 1, pp 1-17,
January 1983. The original thesis is available from the digital library
of MIT theses at http://theses.mit.edu/. Search under my name for
""Influences from Information Technology on Industry Cycles"".

Regards,

John Morecroft
Adjunct Associate Professor of Decision Science
London Business School

Tel +44 (0) 20 7262 5050 x3252 Fax +44 (0) 20 7724 7875
jmorecroft@london.edu

Jim Hines · Post by **Jim Hines** » Mon Jun 28, 2004 6:48 pm

John Morecroft's Ph.D. dissertation is on MRP and inventory-production
cycles. Morecroft, John. 1979. Infulences from information Technology on
Industry Cycles. MIT.

From: ""Jim Hines"" <jhines@MIT.EDU>

Yaman Barlas · Post by **Yaman Barlas** » Mon Jul 05, 2004 10:43 am

You may find this useful -albeit indirectly and partially related to
your question:
We have done some work on testing the standard inventory control rules
(such as (s, Q), (s,S), (S, R), (s, S, R)) in a dynamic feedback
context. We modeled and replicated them in stock-flow jargon.
Results are summarized in:
""Testing the decision rules used in stock management models (with M.G.
Özevin), Proceedings of the 19th International System Dynamics
Conference, Atlanta, 2001, pp. 32-33. (Full paper on the CD version and
also available at: http://www.ie.boun.edu.tr/~barlas/resume.html).

A newer and updated version is about to appear (around November) as:
""Analysis of stock management gaming experiments and alternative
ordering formulations (with Özevin, M.G.) Systems Research & Behavioral
Science (to appear).

Finally, we also analyzed the sources of 'bullwhip' effect in the
standard inventory rules as well as anchor and adjust heuristic and
investigated how/to what extent 'information sharing strategies' can be
implemented to reduce the bullwhip in each case. This article is under
review for SD Review:

""Information Sharing Strategies to Reduce Fluctuations and Bullwhip
Effect in Supply Chains""
(with Baris Gunduz). SD review (under review).

If you need more/immediate information, you may contact our web page, me
or better, the authors of the theses (Gunhan Ozevin
<gozevin@ford.com.tr> and Baris Gunduz <bgunduz@ford.com.tr>).
best,
Yaman Barlas
From: yaman barlas <ybarlas@boun.edu.tr>

***Please NOTE the telephone change***
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Yaman Barlas, Ph.D.
Professor, Industrial Engineering Dept.
Bogazici University,
34342 Bebek, Istanbul, TURKEY
Fax. +90-212-265 1800. Tel. +90-212-359 7073
http://www.ie.boun.edu.tr/~barlas
SESDYN Group: http://www.ie.boun.edu.tr/labs/sesdyn/
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