Summary The non-statement view of scientific theories contains a new conception of theoreticity: A function is „T-theoretical if T must be presupposed for its calculation. On the basis of this conception some philosophers came to the conclusion that scientific theories are not empirically testable because they contain T-theoretical functions. It is claimed that the attempt to test them ends in a circularity: The test of T presupposes T itself.

This is the basis of the first part of the book.

Are empirical theories empirically testable? In this article Theoretische Begriffe und die Prüfbarkeit von Theorien V. Gadenne comes to the conclusion that theories are testable. On this basis he criticizes the non-statement view which asserts the contrary. It is shown that this criticism, however, is erroneous.