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what's a legacy system?
What's a Legacy System?
posted by Anna Mar, January 06, 2012
A Legacy System is an information system (computer system) that's out of date with current technologies and system design approaches.
The term has a negative connotation. It implies that the system is marked for replacement. The term is sometimes used inaccurately (i.e. just because a system doesn't use the latest trendy technologies doesn't automatically make it legacy). There are 8 things that can make a system legacy:
1. Hardware
A system that's incompatible with new hardware. Hardware failure becomes a significant business risk.
2. Scalability
A system architecture that can't support projected business volumes.
3. End of Support
A system that's no longer supported by the vendor who created it. This also applies when sub-systems, components, libraries, programming environments and operating systems reach end of support.
4. Skills
When the skills required to support the system have become rare. Key staff turnover becomes a business risk.
5. Extensibility
When the system lacks hooks that allow it to be extended to meet new business requirements.
6. Efficiency
When IT services related to operating or extending the system are expensive (as compared to modern systems).
7. Usability
When the system has low usability (as measured by user satisfaction with the system).
8. Quality
When the system has chronic quality problems.
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