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Hendrik Kniberg has this seductive and intuitive illustration of the concept of horizontal vs vertical stories.

Alas, I cannot think of a better illustration to firmly and finally convince my hardware engineering colleagues that Agile is utterly deluded, purely on sound engineering principles, and hence useless.

I challenge you to come up with something that will illustrate the concept in a similar manner, but would not cause an Engineer to rage and throw things at the screen.