The Guerra Scale
Tim Guerra & Dan Heffernan,
Learning Circuits,
Mar 23, 2004
You will notice, at the very bottom of the Guerra scale of levels of user experience, at the worst level possible, is PDF. So of course I'm going to cite this paper, no matter what else it says. After PDF, we get things like page turners, online tests, movement in text and graphics, multimedia, and eventually, full immersive simulations or virtual reality.
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