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Legacy Systems in Software Engineering SE26

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The document discusses legacy systems, which are older software systems that are still vital to an organization. It defines legacy systems and explains why they are important. It describes common legacy system structures and functional design approaches. It also discusses assessing the business value and quality of legacy systems to determine the best strategy for evolving or replacing them.

TechnologyBusiness
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Legacy Systems ,[object Object]
Objectives ,[object Object],[object Object],[object Object],[object Object]
Topics covered ,[object Object],[object Object],[object Object]
Legacy systems ,[object Object],[object Object],[object Object],[object Object]
Legacy system replacement ,[object Object],[object Object],[object Object],[object Object],[object Object]
Legacy system change ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
The legacy dilemma ,[object Object],[object Object],[object Object],[object Object]
Legacy system structures ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Legacy system components
Layered model
System change ,[object Object],[object Object],[object Object],[object Object],[object Object]
Legacy application system
Database-centred system
Transaction processing
Legacy data ,[object Object],[object Object],[object Object]
Legacy system design ,[object Object],[object Object],[object Object]
A function-oriented view of design
Functional design process ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Input-process-output model
Input-process-output ,[object Object],[object Object],[object Object],[object Object]
Functional design process ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Data flow diagrams ,[object Object],[object Object],[object Object]
Payroll system DFD
Payroll batch processing ,[object Object],[object Object],[object Object],[object Object],[object Object]
Transaction processing ,[object Object],[object Object]
Design description of an ATM
Using function-oriented design ,[object Object],[object Object]
Legacy system assessment ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
System quality and business value
Legacy system categories ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Business value assessment ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
System quality assessment ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Business process assessment ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Environment assessment
Application assessment
System measurement ,[object Object],[object Object],[object Object],[object Object]
Key points ,[object Object],[object Object],[object Object],[object Object]
Key points ,[object Object],[object Object],[object Object],[object Object]

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