Design Agility? (was: Duplication vs Intention Revealing code)

Let's say your customer tells you there's an additional
requirement. Your code must also support representing numbers
as German words.

Although this is a simpler requirement than full I18N I
suspect it will have a significant impact on the designs. How
could we measure the agility of the existing designs? For
example, would the percentage of statements modified be a 
useful metric for this purpose? Could that percentage also
tell us whether the original design "evolved" or a new one
was created?

Which design would be the most agile given the additional 
requirement and why?

Steve

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