Define UCD please.

(Suspects irony in this request.)

User Centered Design: http://en.wikipedia.org/wiki/User-centered_design

I'd realized that after doing some Googling.

The lack of explanation of that acronym, however, fails the principle itself. User-centered design (or in this case, RSW -- reader-centered writing) would have expanded and defined the acronym on first use.

The failure of the author to do just that severely undermines his credibility (and the article is scattered to boot).

Urine collection device.

One of those things where, if you need it, you'll know what it is.

I was thinking Unicode Character Database. Or perhaps Usual Childhood Diseases.

So many concepts. 17,576 TLAs.