Decision Support with Web-Decision Support with Web-Enabled SoftwareEnabled Software

bybyMarc-David CohenMarc-David Cohen

Charles B. KellyCharles B. KellyAndres L. MedagliaAndres L. Medaglia

What is a legacy system? What is a legacy system?

““LargeLarge software systems that we do not software systems that we do not know how to cope with but that are know how to cope with but that are vital to our organisation” (Bennett, vital to our organisation” (Bennett, 1995)1995)

““Legacy Software is critical software that Legacy Software is critical software that cannot be modified efficiently” (Nicolas cannot be modified efficiently” (Nicolas Gold, 1998)Gold, 1998)

Modernization Approach Modernization Approach

IRP: Inventory Replenishment PlanningAPS: Advanced Planning and SchedulingPDIO: Production Distribution and Inventory Optimization

Pros and Cons of Legacy Pros and Cons of Legacy Systems Systems

• Company’s Company’s transaction transaction history history

• ““Wide-spread Wide-spread usage and usage and acceptance within acceptance within the organisation” the organisation” (Stenbeck, 2001)(Stenbeck, 2001)

• Linking via other Linking via other application is application is hard/impossiblehard/impossible

• Difficult to changeDifficult to change

Modernization Benefits Modernization Benefits

Improved decision makingImproved decision making

Improved productivity

Better time to market

Improved planning & monitoring

Reduced levels of stockAccuracy & consistency of information

ReferencesReferences

• http://www.comp.lancs.ac.uk/computing/users/http://www.comp.lancs.ac.uk/computing/users/oboler/LEGACY2.DOC oboler/LEGACY2.DOC

• http://www.softresources.com/topics/methodology/http://www.softresources.com/topics/methodology/legacy_systems.htmlegacy_systems.htm

• http://www2.cio.com/consultant/report2337.htmhttp://www2.cio.com/consultant/report2337.htmll • http://www.developer.com/mgmt/article.php/1492531http://www.developer.com/mgmt/article.php/1492531• http://oipr.depaul.edu/open/general/poster_2.ppthttp://oipr.depaul.edu/open/general/poster_2.ppt• http://www1.sungard.com/sungard/europa/http://www1.sungard.com/sungard/europa/

sungardeuropa2004/images/sungardeuropa2004/images/sungardeuropalivingwithyourlegacy15jun04v1.pdfsungardeuropalivingwithyourlegacy15jun04v1.pdf

• http://www.zjournal.com/PDF/erlikh.pdfhttp://www.zjournal.com/PDF/erlikh.pdf