Legacy system - Definition - Introduction of Software Engineering

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• Nirja Shah   -Posted on 12 Oct 15
  - A legacy system, in the context of computing, refers to outdated computer systems, programming languages or application software that are used instead of available upgraded versions.
  
  - They are associated with terminology or processes that are no longer applicable to current contexts or content, thus creating confusion.
  
  - In theory, it would be great to be able to have immediate access to use the most advanced technology.
  
  - But in reality, most organizations have legacy systems - to some extent.
  
  - A legacy system may be problematic, due to compatibility issues, obsolete or lack of security support.
  
  - A legacy system is also known as a legacy platform.
  
  - Legacy systems are high maintenance and may involve intricate patching and modifications.
  
  - Porting techniques are often used for software adjustments or adaptation.
  
  - Older hardware may require added compatibility layers to facilitate device functionality in incompatible environments.
  
  - An organization might continue to use legacy systems for a wide range of reasons, such as the following:
  
  1. "If it ain't broke, don't fix it!" The system might work adequately.
  
  2. The system is complex, and documentation is poor. Simply defining scope can be difficult.
  
  3. A redesign is costly, due to complexity or monolithic architecture.

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