Thanks for the education Professor. I didn't have the Human Factors Engineering/Ergonomics Dictionary handy at the time.

In fact, I didn't think the meaning you choose, for the words that you use was the topic of this thread. My bad.

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Regarding what I thought was the topic: Serious Competition
It is my humble opinion that for the vast majority of potential customers, the concept of an Internet Tablet may not be very well defined. Further, if one is "usable" (capable of being used/convenient and practicable for use) may very well depend on the format and content available on the web. This is changing every day. Also, content requirements and expectations are different for each user.

A strong user community is needed to help focus these expectations. Again, IMHO the NIT's have a head start in this regard. Strong support is also required. In addition, a strong commitment from within the manufacturing company is required and Nokia so far has held up their end, from what I've seen.

Given these requirements for the very small margin of success Nokia has enjoyed with their Internet Tablets, a new offering from another company using a new form, new hardware, and a new OS; that was not developed from within that company, will have a hard time competing. Particularly in a new market that isn't well defined.