http://writetodone.com/2009/12/17/the-golden-rule-of-writing/

One of the ideas that has stuck with me from my brief stint consulting with Microsoft's marketing department is the concept they called "Defend Every Word" as a shorthand editing technique for all publicly facing prose. The concept is that one should be able to point to each word in their document and defend the veracity of its claim and the necessity of its inclusion in the document.  It's useful for cutting out buzzwords, refining pitches, and clearing out room for misinterpretation in web copy. Though it often encourages terse writing, in practice treating each word as an essay's thesis awaiting facts in its defense can generate more verbiage through the process.