13. Reusing Requirements

in which we look for requirements that have already been written and explore ways to reuse them

In our everyday lives we all consciously (or, more commonly, unconsciously) reuse knowledge. If we are experienced drivers, then we do not consciously think about how to drive. We can make a cup of tea without rediscovering how many spoons of tealeaves we should use. We write a letter without looking up where to put the recipient’s address, and how to start and end the letter. In these and many more everyday situations, we reuse knowledge. It is knowledge that we have gained by studying and practicing what we have already discovered for ourselves, or more often what others have already defined. It does not occur to us to ...

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