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It's a curious question. Why do you ask it?
My first reaction is to define in this given context evolution as
extensibility in a specific direction (in your examples - adding or rating
content - improving quality of knowledge).
> Hi Folks,
> I am interested in hearing your thoughts on the differences between an
> information system that is extensible versus an information system that is
> For example, suppose that Amazon.com gives users the ability to do a
> search. Further, suppose that Amazon empowers its users to create new
> keywords (and map the new keywords to information at the Web site). Is
> support for new keywords an example of extensibility or evolution? By
> adding new keywords has Amazon merely been extended, or has it evolved?
> Let's take another example. Suppose that Amazon gives users the ability
> search by book category (e.g., Fiction, Non-Fiction, etc.) Further,
> that Amazon empowers its users to create new categories (and map the
> categories to information at the Web site). Is this support for new
> categories an example of extensibility or evolution? By adding new
> categories has Amazon merely been extended, or has it evolved?
> If adding new keywords and adding new categories are merely examples of
> extension, then can you give an example of evolution? /Roger