Proofreading is an essential part of music preparation, whether it’s engraving for publication, a recording session, or for performance.

It’s more than merely having an eye for detail. Good proofreading really boils down to having an efficient and methodical / systematic approach which allows every aspect of the music on every page to be examined consistently and thoroughly.
I recommend the method advocated by William Holab and David Fetheroff in “The G. Schirmer/AMP Manual of Style and Usage” as a great starting point. Once you’ve learned how it works, you may modify the process somewhat, as I have, but the gist is, you want to specifically target groups of musical elements one at a time in a methodical manner to produce consistent and accurate results.
In the G. Schirmer system, the proofreader prints out a copy of the score or part and pencils the following letters at the top of the page, crossing each letter off as that task is complete:
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