Although the term began as a self-designation, part of the confusion surrounding it stems from the fact that it has rarely been used in this way, with few political figures openly describing themselves as "populists". As noted by the political scientist Margaret Canovan, "there has been no self-conscious international populist movement which might have attempted to control or limit the term's reference, and as a result those who have used it have been able to attach it a wide variety of meanings." In this it differs from other political terms, like "socialism" or "conservatism", which have been widely used as self-designations by individuals who have then presented their own, internal definitions of the word. Instead it shares similarities with terms such as "far left", "far right", or "extremist", which are often used in political discourse but rarely as self-designations.