Reformism (also called revisionism or revisionist theory) is the belief that gradual changes in a society can ultimately change its fundamental structures. It is a key component of the movement known as democratic socialism. This movement is contrasted to "revolutionary socialism", which believes that there must be a revolution to fundamentally change a society.
The term "Reformism" is usually applied to the political left. Reformists are seen as centre left. Some Social Democratic parties such as the Canadian NDP are considered reformist.
