Software reengineering is defined as the process of updating existing software by adding additional features and functionalities to improve maintainability. It involves examining and altering legacy systems to create new versions that improve cost, quality, customer service, and delivery speed. The reengineering process consists of three main stages: reverse engineering to understand the system, restructuring through code and data changes, and forward engineering to integrate new specifications.

1. SOFTWARE
REENGINEERING
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Definition
Reasons for Reengineering
Reengineering Process

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Software Reengineering is the process of updating software.
This process includes developing additional features on the
software and adding functionalities for better and more
efficient software. As far as the definition goes, this process
also entails that the software product will have improved
maintainability.
This is the examination and alteration of a legacy 0r existing
system to reconstitute it in a new form.
It affects positively at software cost, quality, service to the
customer and speed of delivery.

4. Why Reengineering?
1. There is continuous improvement of
software for better development and
customer experience.
2. It promotes quality enhancement of
existing systems.
3. It does not only better organisational services
but also contributes added revenue.
4. It is a cost-effective method for software
development. Why? This process allows the
developer to discover unnecessary elements
implemented in the current software and
remove them from the system.
5. The need to accommodate fast and
constantly changing industry requirements.
6. Cost Saving: It minimises costs(time,
financial, direct, indirect, ) that are incurred.
If a client needs a product already
developed but requires added features,
the developer may only have to reengineer
the existing one to maximize development
efficiency.
7. It makes the systems easier to maintain.
8. Increases productivity through code and
database optimisation.- The system will
become efficient and effective.
9. There is reduction of risks such as fault
fallibility.
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5. Software Reengineering Cycle
Three main levels of software
reengineering process:
1. Reverse engineering
2. Restructuring
3. Forward engineering.

6.  This involves the
reproduction of another
developer’s system
following a detailed
examination of its source
code or composition.
 Inventory analysis and
document analysis is
done.
 This involves code and Data
restructuring
 It involves rearranging or
reconstructing the source code
 It promotes system reliability
and maintainability.
 It involves the elimination or
reconstruction of the parts of
the source code (debugging).
 It keeps system updated
through eliminating obsolete or
older versions of certain parts
of the system (such as
programming implementation
and hardware components
 Also known as Renovation
/ Reclamation.
 This is the process of
integrating the latest
specifications based on
the results of the
evaluations from reverse
engineering and
restructuring.
 It involves updating of
software through
integration.
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