 Commentators have drawn attention to a number of shortcomings of Bolzano’s proposals (see, e.g., Mancosu, 1999, Rumberg, 2013, Roski, 2017). This would not have surprised him, since he was himself aware that the above criteria could generate conflicts (see, e.g., 2004a, §17), and had frankly admitted that his remarks about grounding were tentative and incomplete, merely a first attempt to circumscribe the concept: