Question: in software engineering Abstraction, refinement and alteration Principle of alteration is not clear at all. The following are not clear. What it is changing please?

in software engineering Abstraction, refinement and alteration Principle of alteration is not clear at all.

The following are not clear. What it is changing please? give example

--The making of some changes to a system representation is known as alteration.

--Alteration does not involve any change to the degree of abstraction, and it does not involve modification, deletion, and addition of information. I do not understand here the two points

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