According to this approach, populism is viewed as a "thin ideology" or "thin-centred ideology" which on its own is seen as too insubstantial to provide a blueprint for societal change. It thus differs from the "thick-centred" or "full" ideologies such as fascism, liberalism, and socialism, which provide more far-reaching ideas about social transformation. As a thin-centred ideology, populism is therefore attached to a thick-ideology by populist politicians. Thus, populism can be found merged with forms of nationalism, liberalism, socialism, federalism, or conservatism. According to Stanley, "the thinness of populism ensures that in practice it is a complementary ideology: it does not so much overlap with as diffuse itself throughout full ideologies."