Without deliberate planning on anyone's part, there have developed in our type of social system, and correspondingly in others, mechanisms which, wit… - Talcott Parsons

In a sense the present work is to be regarded as a secondary-study of the work of a group of writers in the field of social theory. But the genus "secondary study" comprises several species; of these an example of only one, and that perhaps not the best known, is to be found in these pages.

The most promising lines of development of theory in the sociological and most immediately related fields, particularly the psychological and cultural, therefore, seem to be two-fold. One major direction is the theoretical elaboration and refinement of structural-functional analysis of social systems, including the relevant problems of motivation and their relation to cultural patterns. In this process, the structure of social action provides a basic frame of reference, and aspects of it become of direct substantive importance at many specific points. The main theoretical task, however, is more than a refinement of the conceptual scheme of the presently reprinted book — it involves transition and translation to a different level and focus of theoretical systematization.

Ideology is a system of beliefs, held in common by the members of a collectivity.