The International Space Station flight control positions used by NASA in Houston are different from those used by previous NASA programs. These differences exist primarily to stem the potential confusion that might otherwise follow from conflicting use of the same name in two different rooms during the same operations, such as when the space shuttle was conducting mated operations with the space station. There are also differences in the control positions because of differences in the operation of the two. The following is a list of those flight controllers located in Mission Control Center - Houston. There are several other control centers which house dozens of other flight controllers that support the vastly complex vehicle.