A legacy system is an existing computer system or application program which continues to be used because the user (typically an organization) does not want to replace or redesign it. Many people use this term to refer to "antiquated" systems.

Legacy systems are considered to be potentially problematic by many software engineers (for example, see Bisbal et al., 1999) for several reasons. Legacy systems often run on obsolete (and usually slow) hardware, and sometimes spare parts for such computers become increasingly hard to obtain. These systems are often hard to maintain, improve, and expand because there is a general lack of understanding of the system. The designers of the system may have left the organization, so there is no one left to explain how it works. Such a lack of understanding can be exacerbated by inadequate documentation or manuals getting lost over the years. Integration with newer systems may also be difficult because new software may use completely different technologies.

Despite these problems, organizations can have compelling reasons for keeping a legacy system, such as:

• The costs of redesigning the system are prohibitive because it is large, monolithic, and/or complex.
• The system requires close to 100% availability, so it cannot be taken out of service, and the cost of designing a new system with a similar availability level is high.
• The way the system works is not well understood. Such a situation can occur when the designers of the system have left the organization, and the system has either not been fully documented or such documentation has been lost.
• The user expects that the system can easily be replaced when this becomes necessary.
• The system works satisfactorily, and the owner sees no reason for changing it – or in other words, re-learning a new system would have a prohibitive attendant personal cost in lost time and money.

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CouponScoop (TheCouponScoop.com) Fri, 25 Dec 2009 08:00:10 -0000
Legacy Learning Systems - Sale on Previously Viewed Piano Course - http://thecouponscoop.com/Legacy-Learning-Systems
Legacy Learning Systems - Save On Used Guitar Lesson Classes w/ Online Purchase - http://thecouponscoop.com/Legacy-Learning-Systems
CouponScoop (TheCouponScoop.com) Fri, 25 Dec 2009 06:00:15 -0000
Legacy Learning Systems - Save On Used Guitar Lesson Classes w/ Online Purchase - http://thecouponscoop.com/Legacy-Learning-Systems
working with #text files is killing. it's real pain in the a*s to automatize #legacy systems :S
isagoksu (Isa Goksu) Wed, 23 Dec 2009 18:42:53 -0000
working with #text files is killing. it's real pain in the a*s to automatize #legacy systems :S
Spare Gen Y by dealing with legacy systems. http://bit.ly/6LrUSR
Lowrain (Lowrain) Wed, 23 Dec 2009 17:40:59 -0000
Spare Gen Y by dealing with legacy systems. http://bit.ly/6LrUSR
I was just reading an article on Salesforce. Poor integration with legacy systems. Better luck next time idiots
purugovind (Puru Govind) Wed, 23 Dec 2009 15:10:16 -0000
I was just reading an article on Salesforce. Poor integration with legacy systems. Better luck next time idiots
Three Ways to Deal with Legacy Systems and Spare Gen Y: There’s been a lot of hoopla over Generation Y and th... http://bit.ly/8BJCch #fb
ITBusinessEdge (IT Business Edge) Wed, 23 Dec 2009 14:45:11 -0000
Three Ways to Deal with Legacy Systems and Spare Gen Y: There’s been a lot of hoopla over Generation Y and th... http://bit.ly/8BJCch #fb

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