As I near completion of a manuscript, there are a few things I do that I consider quality checks. Of course spell check, although as we know it doesn't catch everything. I'll read the manuscript backwards at least twice, once when I think I'm finished, and once before I send it in, because it's the easiest way to catch typos that spell check doesn't. I also do a grammar check, although often, depending upon the voice of the piece or character, the grammar may intentionally not follow the "rules."
One other thing I also do at the halfway point, when I'm near the end, and also when I am finished writing the manuscript, is a check for word length and sentence length. Fifteen to twenty words per sentence is considered an average or good sentence length. My sentence average is 14 words per sentence. I am not sure if dashes in sentences count as words on my processing system, or if it ends up counting the sentence as two, but I feel that 14 is probably close enough to the acceptable average. My computer also tells me my longest sentence. Right now, it's 82 words. I am reading carefully to find that sentence, because it seems incredibly long to me.
I also look at average word length, although I haven't seen anything that sets out what a good average word length is. My average word length is 4 characters, although I don't know how important that is, because the computer averages long, complicated words with such words as I, if, and, or, it, he, she, and all those other common short words that appear frequently in novels.
It may seem overly analytical to double check these kinds of things, but I think it helps with readability. My premise is that the more complex the story, the more you need to work to make sure it's easy to read. I want people concentrating on my plot and subplots, not on deciphering my sentences.
I wonder if anyone else has something like this they do when they are completing a work, other than a final proofread, or if I'm just crazy-- not that the two are necessarily mutually exclusive.
I am not quite finished Jambalaya Justice, but am nearing the end, and hopefully my quirks will pay off with a clean manuscript.