The subject of ideology is a controversial one, and it is arguable that at least some part of this controversy derives from disagreement as to the definition of the word ideology. One can, however, discern both a strict and a loose way of using it. In the loose sense of the word, ideology may mean any kind of action-oriented theory or any attempt to approach politics in the light of a system of ideas. Ideology in the stricter sense stays fairly close to Destutt de Tracy’s original conception and may be identified by five characteristics: (1) it contains an explanatory theory of a more or less comprehensive kind about human experience and the external world; (2) it sets out a program, in generalized and abstract terms, of social and political organization; (3) it conceives the realization of this program as entailing a struggle; (4) it seeks not merely to persuade but to recruit loyal adherents, demanding what is sometimes called commitment; (5) it addresses a wide public but may tend to confer some special role of leadership on intellectuals. In this article the noun ideology is used only in its strict sense; the adjective ideological is used to refer to ideology as broadly defined.