The following list is strictly alphabetical and attempts to divide the ideologies found in practical political life into a number of groups and each group contains ideologies that are related to each other. The headers refer to names of the best-known ideologies in each group. The names of the headers do not necessarily imply some hierarchical order or that one ideology evolved out of the other. They are merely noting that the ideologies in question are practically, historically and ideologically related to each other. One ideology can belong to several groups and there is sometimes considerable overlap between related ideologies. The meaning of a political label can also differ between countries and that parties often subscribe to a combination of ideologies.