QuesTec was a digital media company that pioneered virtual replay from real-time measurement data for baseball and tennis.
Paul Baim and the UIS were featured in a 2002 segment of PBS's Scientific American Frontiers called "Baseball Tech".
In its early trial period, baseball analysts questioned whether QuesTec was producing the consistency in umpiring that was supposed to occur.
[2] 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 National Labor Relations Board (NLRB).
The NLRB grievance was dropped by the WUA as part of the contract negotiations with MLB after the 2005 season, ending the legal challenges to the system.