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Reverse Engineering and Re-engineering defination and differences


Reverse Engineering :  
          
               Reverse Engineering is the process of analyzing software with the objective of recovering its design and specification.
OR
     Reverse Engineering is the process followed in order to find difficult, unknown and hidden information about a software system.
     The main purpose of reverse engineering is to recover information from the existing code or any other intermediate documents, any activity that requires program and understanding at any level may fall within the scope of reverse engineering.  The objective of reverse engineering is to derive the design or specification of a system from its source code.

Re-engineering :    Re-engineering means to re-implementing systems to make them more maintainable.  Re-engineering essentially means having a re-look on an entity, such as process, task, design, approach strategy using engineering principles to bring in radical and dramatic improvement.


      Principles of software Re-engineering :   In software re-engineering, we may resort to any one or more of the following :
  • Redefining software scope and goals.  
  • Redefining RDD and SRS by way of additions, deletions and extensions of functions and features.
  • Resorting to data restructuring, improving data base design, code restructuring to make its size smaller and efficient in operations.

       Difference  :   Re-engineering is not the same as reverse engineering but undoubtedly reverse engineering is often a part of re-engineering process to develop better understanding of a system.


S.No
Reverse Engineering
Re-Engineering
1.
The objective of reverse engineering is to derive the design or specification of a system from its source code.
The objective of re-engineering is to produce a new more maintainable system.
2.
It performs transformation from a lower abstraction level to a higher one.
It transform an existing software system into a new but more maintainable system.

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