The classification of these, if it is to be helpful, must embody the terms actually in use. If these terms corresponded to a logical categorization, whether by ingredients, technique of preparation, or purpose, that would be convenient; all the more so if the same categorization prevailed in different countries and languages. However, this is not the situation. The terms in use reflect various methods of categorization, and vary from place to place, including differences between British and American usage.