Other workers experience their own heartaches whenunpredictable schedules leave them unable to make planswith their families or force them to miss graduations,anniversaries, birthday parties, or holiday gatherings. Some workers are pushing to create "sharepools" of workers whose role is to fill in where needed on agiven shift. "It's definitely caused a lot of heartache", said David Hebert,financial officer and former president of United Steelworkers(USW) Local 291, one of three USW locals collectivelyrepresenting about 360 workers at Twin Rivers.