Collectively the auditions and callbacks, being edited down considerably, represent only a minority of episodes and are televised during the first few weeks of a season. Following these episodes are the finals (referred to in some entries as "performance shows" or "live shows"), in which the remaining contestants are matched into couples and are assigned new dance styles—-typically, but not always, assigned by a luck-of-the-draw system—each week. These episodes combine stage performances (including solos, duets, and group routines), short "behind-the-scenes" video packets of the dancers working with their choreographers and each other to master the routines, and judge evaluations of the performances to form the bulk of their run-time, occasionally supplemented by guest performances. These episodes are also the point at which at-home-viewers begin their involvement in the show: their votes (combined with judge decisions) will decide which dancers remain in the competition as eliminations reduce the number of contestants weekly until a finale episode in which the winner is revealed. While most of the above are elements shared by all shows in the franchise, entries vary considerably in the details: the number of finalists, the number of shows per week, the manner in which judge decisions are weighted against home-viewer votes, the styles of dance assigned, presentation style, production values, and even the number of winners are all examples of elements of the format that have fluctuated throughout the run of the franchise.