It is impossible to know how far Williams would have taken Formula 1 technology in the following years without the FIA's rule changes for 1994. Some of their innovations, already developed, were banned before they hit the track. For example, in 1993, in conjunction with the Dutch company VDT, Williams developed a Continuously Variable Transmission system (CVT). Using a system of belts and drives instead of a gearbox, the CVT would have kept the engine in its optimum power band at all times. Although Williams already developed a chassis for it (dubbed the FW15CVT), it never hit the track in public.