 However, this would seem to pose a difficulty: if a theory is to be genuinely testable, it must be possible to determine, at least in principle, whether the basic statements which are its potential falsifiers are actually true or false. But how can this be known, if basic statements cannot be justified by experience? As we have seen, Popper’s answer is that the acceptance or rejection of basic statements depends upon a convention-based decision on the part of the scientific community.