I have questions in software engineering please:

question 1

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Two major dimensions of alteration are:Change in functionality and 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.

can you gve example here please?

Question 2

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An example of rework strategy

is replacing unstructured control flow constructs (GOTOs) with more commonly used structured constructs (for loop) by first generating a control flow graph (CFG) for the given system, then applying a restructuring algorithm to the CFG to produce a structured CFG, and finally translating the new, structured CFG back into the original programming language.

An example of replace strategy is replacing the unstructured control flow with a structured control flow by first representing the program at a higher level without using control flow concepts, then by representing the system at a lower level of abstraction with a new structured control flow.

can you clarify the above steps please it is not clear to me? Use examples please

Thanks