[teye]

Another painfully obvious, no-data article from uxmovement.com.

A minute of Googling gave me a more researched article with more comprehensive suggestions. See 3.5 on p. 390.

http://core.ecu.edu/engl/tpc/MennoMenno/ftp/williams%202000.... (Link fixed, thanks!)

[slouch]

I don't need ANY article to explain this concept, it is, like you said, painfully obvious.

[Semiapies]

Dead link.

[kmfrk]

Works if you remove "25": http://core.ecu.edu/engl/tpc/MennoMenno/ftp/williams%202000....