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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!
Failures
Maintenance
Inappropriate functionality
Lack of documentation
Poor performance
They are inordinately
expensive to maintain
They are
inflexible
to adapt (difficult to adapt to changing business needs)
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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