Pick your battles and outright avoid them by filing on unjust grievances. In my area all grievances are generically written and each one says that the accused is being written up for "continuing to violate such such and such....." That alone is worthy of filing for an unjust grievance. If not.....the accused is basically allowing management to accuse them of repetitively making the same mistake even though
THAT particular infraction had never happened before. But it could be used against them later. If they are being targeted those unchallenged grievances will be brought up again and most labor managers and center managers have been playing the game long enough to know that they only have a 9 month window in which to build a case for progressive discipline and they do it well. There was a recent thread that is a perfect example of why to file on every grievance.
http://www.browncafe.com/community/...iques-for-defending-a-driver-at-panel.358841/
If that driver had any unchallenged grievances still sitting in his file then those that were targeting him wouldn't have had to attempt to fire him/her by only nitpicking at the results of his/her OJS ride and the resulting failed metrics. They would have combined everything and they would have had a pretty strong case for progressive discipline with those mostly unrelated, but
unchallenged, grievances. And if their warning letters are worded similarly to the ones in my area then they'd be toast. That is exactly why we are encouraged to file on every warning letter in my local. It's good advice so I follow it. But then again....I've only had two warning letters in my 16 years with UPS but that's beside that point.