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Legacy System

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Legacy Systems


Older software systems that remain vital to an organisation ©Ian Sommerville Software Engineering, 6th edition. Chapter 26

Slide 1

Objectives







To explain what is meant by a legacy system and why these systems are important
To introduce common legacy system structures To briefly describe function-oriented design
To explain how the value of legacy systems can be assessed

©Ian Sommerville Software Engineering, 6th edition. Chapter 26

Slide 2

Topics covered




Legacy system structures
Legacy system design
Legacy system assessment

©Ian Sommerville Software Engineering, 6th edition. Chapter 26

Slide 3

Legacy systems
Software systems that are developed specially for an organisation have a long lifetime 
Many software systems that are still in use were developed many years ago using technologies that are now obsolete

These systems are still business critical that is, they are essential for the normal functioning of the business

They have been given the name legacy systems ©Ian Sommerville Software Engineering, 6th edition. Chapter 26
Slide 4


Legacy system replacement


There is a significant business risk in simply scrapping a legacy system and replacing it with a system that has been developed using modern technology







Legacy systems rarely have a complete specification.
During their lifetime they have undergone major changes which may not have been documented
Business processes are reliant on the legacy system
The system may embed business rules that are not formally documented elsewhere
New software development is risky and may not be successful ©Ian Sommerville Software Engineering, 6th edition. Chapter 26

Slide 5

Legacy system change




Systems must change in order to remain useful However, changing legacy

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