Some see it as a user experience requirement that will ultimately spell the demise of digital display advertising.

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Practical experience with a real commercial aircraft is a requirement of the Civil Aviation Authority (CAA) if students are to qualify as licensed aircraft maintenance engineers.

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"Maybe 20 years' experience in the game isn't the right requirement for Scottish football, " said Jefferies.

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The second change: a requirement that no person could be elected president without prior military experience.

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Touch has been in the marketplace for a while on Windows PCs but never took off either due to lack of a touch-optimized OS and apps, low quality quality experience of resistive touch controllers on previous devices, and in many cases the requirement for a pen versus a finger.

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But while direct experience often affords the best view of artwork, by no means are plane tickets a requirement, since the world can also be traveled on the web.

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