Problems of such systems
From the book: "Migrating Legacy Systems: Gateways, Interfaces & the Incremental Approach" (Morgan Kaufmann Series in Data Management Systems; ASIN: 1558603301 - April 1995) by Michael L. Brodie, Michael Stonebraker (Contributor), Michael Stonebraker
Costs due to problems of single legacy IS often exceed
hundreds of millions of dollars per year!
They are brittle (easily broken when modified for any purpose)
Perhaps they will one day break beyond repair
Lack of techniques or technology to fix legacy IS problems
Consequences of such problems
Apoplexy:They consume 90% to 95% of all IS resources
This prevent organizations from moving to newer software
Organizations are prevented from rightsizing that involves moving from large mainframe computers to smaller, less expensive that fully meet current IS requirements
New requirements cannot be developed with the 5% to 10% remaining resources
Develop new functionalities means extra-resources have to be found, which means calls to extern staffing or outsourcing and so increase costs
The organization is not fully master of its development strategy since it has to take account the cost of external resources to maintain the legacy application and to develop the new applications Please read then the practical problems described as a list of claims about such systems, decisions and consequences resulting from the decisions.
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