Clients need to determine set metrics (economic, operational and service) with direct linkage to specific mission requirement(s).

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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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Microsoft are making similar moves with Windows Phone to direct people to register via a Windows ID and set up payment for the Windows Store, and Google has the requirement for a Google account and payment details to fully engage with Android.

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