QuesTec was a digital media company that pioneered virtual replay from real-time measurement data for baseball and tennis. Years before competitors introduced similar products, QuesTec had established a reputation for accuracy and reliability. Although originally based on internally developed technology, in 1998 QuesTec moved to tracking technology provided by engineers at the Atlantic Aerospace Electronics Corporation (now a division of L-3 Communications). QuesTec is best known for its Umpire Information System (UIS), used by Major League Baseball for the purpose of providing feedback and evaluation of Major League umpires. The QuesTec company, based out of Deer Park, New York, was mostly involved in television replay and graphics throughout its history. In 2001, however, the company signed a 5-year contract with Major League Baseball to use its pitch tracking technology as a means to review the performance of home plate umpires during baseball games. The contract continued through the 2008 season through annual extensions. The Umpire Information System The UIS consists of four cameras placed around a ballpark that feed into a computer network and record the locations of pitches throughout the course of a game. Two of the cameras are located high in the stands above the 1st and 3rd base lines to track the trajectory of each pitch. The other two are located at field level and record the stance of the batter so the top and bottom of the strike zone can be set. Computer software then generates CDs that umpires and MLB executives can review and learn from. These CDs include video of the pitches as well as graphic representations of their locations plus feedback on the umpires' accuracy. The UIS was featured in a 2002 segment of PBS's Scientific American Frontiers called "Baseball Tech". When first introduced, controversy over the Umpire Information System quickly developed as umpires and players alike voiced concern over the system's accuracy and the fact that limited deployment (6 parks in the first year) might not guarantee uniform umpiring in the remaining parks. In its early trial period, baseball analysts questioned whether QuesTec was producing the consistency in umpiring that was supposed to occur. A report by a QuesTec operator a year later suggested that the system still needed to be tweaked. The controversy was fueled, in part, by several attempts by the World Umpires Association (WUA) to have the system removed through legal action, culminating in a dispute filed with the