environment

1. SOFTWARE
RE-ENGINEERING
PRESENTED BY: AMAN GAUR
MCA

2. WHAT IS RE-ENGINEERING?
 Examination and alteration of a system to
reconstruct it in a new form
 Reorganising and modifying existing
software systems to make them more
maintainable

3. STEPS INVOLVED IN RE-
ENGINEERING
 Source code translation
 Reverse engineering
 program structure improvement
 program modularisation
 data re-engineering

4. SOURCE CODE
TRANSLATION
 Converting code from one language to
another
 need of translation:
-> Hardware platform update
-> staff skill shortage
-> organisational policy changes

5. Conceptual Conceptual
System
Requirement
s
System
Requireme
nts
System
Design
System
Design
System
Implementa
tion
System
Implementati
on
Reverse
Engineeri
ng
Existing
System
New System
Forward
Engineering
Re
Think
Re
Specify
Re Design
Redo
Coding

6. Inventory
Analysis
Forward
Engineering
Document
Reconstruction
Data Re-
Construction
Reverse
Engineering
Code Re-
Construction
RE-ENGINEERING

7. REVERSE ENGINEERING
 Reorganising and modifying existing software
systems to make them more maintainable
 the program itself is unchanged
 it is not the same as re-engineering

8. PROGRAM STRUCTURE
IMPROVEMENT
 Reorganising and modifying existing software
systems to make them more maintainable
 the program may be automatically restructured
to remove unconditional branches
 conditions may be simplified to make them more
readable

9. PROGRAM MODULARISATIO
 The process of re-organising a program so
that related program parts are collected
together in a single module
 different modules can be created:
-> Hardware modules
-> functional modules
-> process support modules

10. DATA RE-ENGINEERING
 Involves analysing and reorganising the data
structures in a system to make it more
understandable
 objective is to create a managed data
environment

11. CONCLUSION
• Software re-engineering is a cost effective option
for system evolution
• consists of many sub-processes
• the objective of re-engineering is to improve the
system structure to make it easier to understand
and maintain

12. THANK
YOU