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Reverse engineering: Activity to create an easier to understand and more abstract form of the system. Forward engineering: The traditional process of moving from a

Reverse engineering: Activity to create an easier to understand and more abstract form of the system.
Forward engineering: The traditional process of moving from a high-level abstraction and logical, implementation-independent design to the physical implementation of the system.
Two major dimensions of alteration are:
1-Change in functionality
2-Change in implementation technique
A change in functionality
-Comes from a change in the business rules.
-A modification of the business rules results in modifications of the system.
-Change of functionality does not affect how the system is implemented, that is, how forward engineering is carried out.
-Modifications made to the system that affect its intended behaviour.
A change of implementation technique
-Refers to modifications made to the system that affect how it is built & structured, without affecting its intended behaviour.
-Changing the programming language from procedural to OO language.
-An end-user of a system never knows if the system is implemented in an OO or a procedural language.
Change in functionality is not clear to me. Please give examples. Thanks

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