 Most years there are 20 couples, but this number can vary slightly from year to year, although the total number of couples in the performance must be divisible by the number four, since the root word "quad" refers to the number four, and couples are arranged in squares of four couples each, as in American square dancing.Each couple is announced as they are first presented and make their way onto the ballroom floor.There is also a Caller who keeps announcing what steps are to be done next, throughout the dance.