I spent a couple of weeks at one of NCS Pearson's grading warehouses back in 2001.
When I got there, it was just as was described in the article: I had a one day orientation and then was given sample essays to grade to see that I could follow the rubric.
Once in the grading center, we were told that at minimum, we needed to grade 8 packets of tests. Each packet had 18-25 essays, give or take. For the first couple of days, I really bore down and read through each essay and tried to justify my grade. I was consistently off on my grades.
So, I decided to judge the tests based solely on the first sentence, the last sentence, and how many paragraphs were in between. Voila! My eight packets were usually done before lunch, and commendations were being handed to me for my speed and accuracy. Most days, I sat around with a packet after lunch and took the whole afternoon to grade it while I wrote out outlines for short stories on a notepad. On the day I decided to see how many packets I could get done if I applied myself, I got through twenty two of them.