ABSTRACT
The twentieth century has been given many "nicknames" because of the dramatic, even tragic events that occurred in it, because of unbelievable development of science and technology during the period, and quite a few other reasons. The century deserves also one more nickname—the age of praxiology because of intensive development of human action theories whether praxiological of their nature and name or covered under different names and approaches. To understand that humanities and social studies are about entities already captured by regular humans, not scientific but just human understanding. Znaniecki elaborated an action theory, a humanistic one, based on a concept of activity, which is human and only human. It is not a behavior of any technological system or biological system. Raising of an ideal is the most complicated activity system. An ideal is an ideal complex of activities as an object of human aspirations projected to the future.
