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I have to agree with Mr. North: when it comes to applying metrics
to documentation, you are really straining at gnats.
If you have a grammar, spelling, and style checker (such as
Grammatik V), you can shoot for such things as writing at grade
level, no spelling or punctuation errors, and minimum percentage of
sentences written in the passive voice. Trying to metrify anything
else is probably a waste of time, since the "quality" of a document
is largely subjective.