The concept of ideology plays an important part in contemporary social and political thinking. In many works which raise the question about the relationship between what men think and how their societies operate some mention of ideology is made. Since the variety of thinkers who write about this relationship have a variety of views on the subject, it is not at all surprising that they disagree about just what an ideology is. It might be helpful if we could agree on (...) just one usage, or, failing that, understand why a variety of usages is necessary and understand them. (shrink)