They look at them very hard. There's just no way to know everything. For instance, maybe the entire company is up 2%, so you plan that way, and overall, it might even come in right at 2%.
But the shipper 5 miles up the road releases 5k packages for a marketing blitz. That local sort / twilight will be saying "Who's the idiot that thought we'd be up 2%? They did this to cut staffing and screw the union/employees!" etc.
So poll the shippers, most would say. I've personally gone on road back in the day and I couldn't get a straight answer from some smaller companies on the Tuesday before Thanksgiving whether they were open on the Friday after Thanksgiving.
If anyone solves that mathematical chaos problem accurately, he or she will be wealthy enough not to have to worry about job conditions at UPS anymore.
Yeah, I hear you. Like I said, I know there's a method but....
Okay, so as a preloader the numbers I'm talking about are the load sheets that forecast each car's projection for the day. Key word there being projection, but still, I"m told to load bulk stops based off of load sheets that are incomplete for the most part.
"Incomplete" during peak meaning I'll show up to load sheets that forecast my trucks for 13, 29, 22 pieces and no bulk stops, knowing damn well that each truck is going to come close to 400-500 pieces with insane bulk stops like beauty salons, targets, wal-marts, post offices and the like.
That kind of information is hard to plan around and the frustration's gotta get vented somewhere... better at some faceless, nameless
in my head than the supervisor that could probably get me fired if I aimed some of my thoughts their way.