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Functional Architecture for system testing coverage

In 2005, I chanced to find that my functional architecture diagrams could be used for more than just explaining functionality to developers. I noticed that I could draw paths across the diagram, sometimes converge multiple paths, and these paths could effectively become a set of system test cases. Drawing these paths across also showed me if I was touching everything and if I was touching everything enough in my system testing. 

I think this testing coverage method need not be just for software. Even cars, gadgets, plumbing , everything has a functional architecture. May be we should use that to see if we are testing sufficiently. 

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