ABSTRACT
The question whether there is such a thing as a falsifiable singular statement (or a ‘basic statement’) will be examined later. Here I shall assume a positive answer to this question; and I shall examine how far my criterion of demarcation is applicable to theoretical systems-if it is applicable at all. A critical discussion of a position usually called ‘conventionalism’ will raise first some problems of method, to be met by taking certain methodological decisions. Next I shall try to characterize the logical properties of those systems of theories which are falsifiablefalsifiable, that is, if our methodological proposals are adopted.
