First published in 1980. Of all the concepts deployed in the study of politics the application of the concept of ideology is by far the least precise. Those who have sought to clarify its meaning have concluded that ideology is not an independent constituent of political life and indispensable to an adequate representation of the form of political association; but, rather, a kind of epiphenomenal, parasitic and irrational thought that misguides the unfortunate, ignorant or confused in the pursuit of the unobtainable.