5.6 Secondary Value-Related External and Internal Functions

Once a system delivers its primary value-related function, there is no reason why it should not also be designed to deliver other secondary value-related functions. Team X could produce the design and secondarily create reports to document the decision. The circulatory system could return carbon dioxide to the lungs, in addition to delivering oxygen. The operational amplifier could filter high-frequency noise, in addition to amplifying.

It is important to identify these secondary functions, because they are expected by customers and are a source of competitive advantage. Question 5d of Table 5.1 is “What are the other important secondary value-related external functions?” These other ...

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