Scottish Country Dancing (SCD) is a sociable dance form with roots stretching back for centuries. Participants are grouped into sets, typically of 3, 4, or 5 couples arranged either in two lines (men facing ladies) or in a square, and work together to dance a sequence of formations. This will leave them in a new order, and the dance is repeated enough times to bring them back to their starting positions, with everyone dancing each position in turn. SCD is mainly danced socially, for the pure pleasure and enjoyment, but many groups also perform, and there are even occasional competitions (which have a mixed response from dancers). Although the basic steps and formations are easy to pick up, the technique is being honed continuously so that at its highest levels it is now an extremely athletic, balletic dance form (not that the majority of social dancers take it as seriously as that...).