Reading Usable Help
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Gordon R. Meyer
A succinct guide to being succinct
Peter Cooper's web site Rich Language examines the English language and associated history, dialects, and writing styles. In The Editing Process, Cooper offers a handful of useful techniques for trimming text by two thirds of its original size without losing any meaning. He also links to several other insightful resources for writers who wish to make their writing shorter, easier to read, and friendlier on the brain.
Another brief article, Origin of OK, provides fodder for Help authors who wish to entertain their colleagues with the etymology of the wording behind the ubiquitous OK button.
Thanks for the link, Nat.