 In these approaches to the constituents of the universe, modal notions could be understood in accordance with the so-called ‘statistical’ or ‘temporal frequency’ model of modality where the meaning of modal terms is spelled out extensionally as follows: what is necessary is always actual, what is impossible is never actual and what is possible is at least sometimes actual. The term ‘statistical interpretation of modality’ was introduced into the modern discussion by Oscar Becker (1952), and it has been applied since in descriptions of certain ways of thinking in the history of philosophy as well, particularly by Jaakko Hintikka (1973).