Because of the style's origins in British parliamentary procedure, the two sides are called the "Government" and "Opposition", while the speakers take their titles from those of their parliamentary equivalents (such as the opening Government speaker, called the "Prime Minister"). Furthermore, since this style is based on parliamentary debate, each faction is considered to be one of two parties in a coalition. They must therefore differentiate themselves from the other team on their side of the case in order to succeed in their own right.