Thanks for clearing that up. "replaced by a computer" didnt seem accurate. I had wondered how a computer would call a balk, call safe/fair, etc. As for the computer system to call balls and strikes, how does it know to change the strike zone based upon the players height? If a player's stance changes mid-pitch to adjust for the pitch, buckling knees. Too many questions in my mind, yet, but perhaps it would do. I'm not sure how a quetec system would change/eliminate a "diva" umpire. Mangers and players whine equally as much about plays at the plate, etc as they do balls and strikes