> more importantly the concepts underneath that UI and the mental model it requires - will be related to the stuff they already know. And, perhaps most importa

> more importantly the concepts underneath that UI and the mental model it requires - will be related to the stuff they already know. And, perhaps most importantly - if they don't learn, they can be removed. Big difference between UI for work, and UI for fun. You can design differently for a captive audience. This can be used for both good and evil (also see: Government websites).