Cocoa, Fla. ? Upset that baseball is using a new computer system to track ball-and-strike calls, the sport’s umpires have hired physicists and engineers to test its accuracy.

They say Questec’s umpire information system is not accurate, especially on breaking pitches. The use of the system has sparked a lawsuit and two grievances, with the WUA saying baseball won’t respond to a list of 50 questions about the system.

The sides agreed after the 2001 season to use the system as a training tool this season.