Curious, what are the highest priority Lawn Mowing screw-ups that could be done by workers, for which you keep an eye out for like a Texan on a Porkchop? Stuff that is hard to reverse, expense, health related, or just a big pain in the butt to deal with. One I recall, was the discharging of clippings of recently iron-fertilized lawn toward wet concrete. Reminds me of what happens in Vegas stays in Vegas. Whatever goes on the lawn, needs to stay on the lawn.